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Finding the Fourth Proportional to 18,643.92, 25,728.64 and 10,690.76

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Solution

The fourth proportional to 18,643.92, 25,728.64 and 10,690.76 is: 14,753.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.92 : 25,728.64 = 10,690.76 : x
  2. Step 2: Convert to fraction form
    18,643.92/25,728.64 = 10,690.76/x
  3. Step 3: Cross multiply
    18,643.92x = 25,728.64 × 10,690.76
  4. Step 4: Simplify right side
    18,643.92x = 275,058,715.37
  5. Step 5: Solve for x
    x = 275,058,715.37/18,643.92
  6. Step 6: Final answer
    x = 14,753.27

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Double scale
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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.