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Finding the Fourth Proportional to 61,139.10, 91,708.65 and 43,424.40

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Solution

The fourth proportional to 61,139.10, 91,708.65 and 43,424.40 is: 65,136.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,139.10 : 91,708.65 = 43,424.40 : x
  2. Step 2: Convert to fraction form
    61,139.10/91,708.65 = 43,424.40/x
  3. Step 3: Cross multiply
    61,139.10x = 91,708.65 × 43,424.40
  4. Step 4: Simplify right side
    61,139.10x = 3,982,393,101.06
  5. Step 5: Solve for x
    x = 3,982,393,101.06/61,139.10
  6. Step 6: Final answer
    x = 65,136.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.