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Finding the Fourth Proportional to 100,311.80, 138,445.02 and 57,862.04

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Solution

The fourth proportional to 100,311.80, 138,445.02 and 57,862.04 is: 79,858.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,311.80 : 138,445.02 = 57,862.04 : x
  2. Step 2: Convert to fraction form
    100,311.80/138,445.02 = 57,862.04/x
  3. Step 3: Cross multiply
    100,311.80x = 138,445.02 × 57,862.04
  4. Step 4: Simplify right side
    100,311.80x = 8,010,711,285.04
  5. Step 5: Solve for x
    x = 8,010,711,285.04/100,311.80
  6. Step 6: Final answer
    x = 79,858.12

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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.