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Finding the Fourth Proportional to 100,388.34, 138,520.17 and 57,938.94

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Solution

The fourth proportional to 100,388.34, 138,520.17 and 57,938.94 is: 79,946.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,388.34 : 138,520.17 = 57,938.94 : x
  2. Step 2: Convert to fraction form
    100,388.34/138,520.17 = 57,938.94/x
  3. Step 3: Cross multiply
    100,388.34x = 138,520.17 × 57,938.94
  4. Step 4: Simplify right side
    100,388.34x = 8,025,711,818.42
  5. Step 5: Solve for x
    x = 8,025,711,818.42/100,388.34
  6. Step 6: Final answer
    x = 79,946.65

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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.