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Finding the Fourth Proportional to 79,139.77, 109,207.31 and 45,140.42

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Solution

The fourth proportional to 79,139.77, 109,207.31 and 45,140.42 is: 62,290.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,139.77 : 109,207.31 = 45,140.42 : x
  2. Step 2: Convert to fraction form
    79,139.77/109,207.31 = 45,140.42/x
  3. Step 3: Cross multiply
    79,139.77x = 109,207.31 × 45,140.42
  4. Step 4: Simplify right side
    79,139.77x = 4,929,663,887.79
  5. Step 5: Solve for x
    x = 4,929,663,887.79/79,139.77
  6. Step 6: Final answer
    x = 62,290.60

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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.