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Finding the Fourth Proportional to 100,062.60, 138,043.54 and 57,612.12

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Solution

The fourth proportional to 100,062.60, 138,043.54 and 57,612.12 is: 79,480.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,062.60 : 138,043.54 = 57,612.12 : x
  2. Step 2: Convert to fraction form
    100,062.60/138,043.54 = 57,612.12/x
  3. Step 3: Cross multiply
    100,062.60x = 138,043.54 × 57,612.12
  4. Step 4: Simplify right side
    100,062.60x = 7,952,980,991.70
  5. Step 5: Solve for x
    x = 7,952,980,991.70/100,062.60
  6. Step 6: Final answer
    x = 79,480.06

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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.