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Finding the Fourth Proportional to 18,381.87, 25,346.71 and 12,706.77

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Solution

The fourth proportional to 18,381.87, 25,346.71 and 12,706.77 is: 17,521.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,381.87 : 25,346.71 = 12,706.77 : x
  2. Step 2: Convert to fraction form
    18,381.87/25,346.71 = 12,706.77/x
  3. Step 3: Cross multiply
    18,381.87x = 25,346.71 × 12,706.77
  4. Step 4: Simplify right side
    18,381.87x = 322,074,687.49
  5. Step 5: Solve for x
    x = 322,074,687.49/18,381.87
  6. Step 6: Final answer
    x = 17,521.32

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Half scale
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Double scale
Find fourth proportional to 18,382.87, 25,348.09 and 12,707.77
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.