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Finding the Fourth Proportional to 61,138.60, 91,707.90 and 43,423.90

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Solution

The fourth proportional to 61,138.60, 91,707.90 and 43,423.90 is: 65,135.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,138.60 : 91,707.90 = 43,423.90 : x
  2. Step 2: Convert to fraction form
    61,138.60/91,707.90 = 43,423.90/x
  3. Step 3: Cross multiply
    61,138.60x = 91,707.90 × 43,423.90
  4. Step 4: Simplify right side
    61,138.60x = 3,982,314,678.81
  5. Step 5: Solve for x
    x = 3,982,314,678.81/61,138.60
  6. Step 6: Final answer
    x = 65,135.85

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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.