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Finding the Fourth Proportional to 15,380.70, 21,210.75 and 11,159.70

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Solution

The fourth proportional to 15,380.70, 21,210.75 and 11,159.70 is: 15,389.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,380.70 : 21,210.75 = 11,159.70 : x
  2. Step 2: Convert to fraction form
    15,380.70/21,210.75 = 11,159.70/x
  3. Step 3: Cross multiply
    15,380.70x = 21,210.75 × 11,159.70
  4. Step 4: Simplify right side
    15,380.70x = 236,705,606.78
  5. Step 5: Solve for x
    x = 236,705,606.78/15,380.70
  6. Step 6: Final answer
    x = 15,389.78

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Half 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.