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Finding the Fourth Proportional to 72,979, 100,711.14 and 39,445

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Solution

The fourth proportional to 72,979, 100,711.14 and 39,445 is: 54,434.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,979 : 100,711.14 = 39,445 : x
  2. Step 2: Convert to fraction form
    72,979/100,711.14 = 39,445/x
  3. Step 3: Cross multiply
    72,979x = 100,711.14 × 39,445
  4. Step 4: Simplify right side
    72,979x = 3,972,550,917.30
  5. Step 5: Solve for x
    x = 3,972,550,917.30/72,979
  6. Step 6: Final answer
    x = 54,434.16

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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.