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Finding the Fourth Proportional to 83,685.70, 125,528.55 and 21,356.20

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Solution

The fourth proportional to 83,685.70, 125,528.55 and 21,356.20 is: 32,034.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,685.70 : 125,528.55 = 21,356.20 : x
  2. Step 2: Convert to fraction form
    83,685.70/125,528.55 = 21,356.20/x
  3. Step 3: Cross multiply
    83,685.70x = 125,528.55 × 21,356.20
  4. Step 4: Simplify right side
    83,685.70x = 2,680,812,819.51
  5. Step 5: Solve for x
    x = 2,680,812,819.51/83,685.70
  6. Step 6: Final answer
    x = 32,034.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.