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Finding the Fourth Proportional to 61,138.10, 91,707.15 and 43,423.40

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Solution

The fourth proportional to 61,138.10, 91,707.15 and 43,423.40 is: 65,135.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,138.10 : 91,707.15 = 43,423.40 : x
  2. Step 2: Convert to fraction form
    61,138.10/91,707.15 = 43,423.40/x
  3. Step 3: Cross multiply
    61,138.10x = 91,707.15 × 43,423.40
  4. Step 4: Simplify right side
    61,138.10x = 3,982,236,257.31
  5. Step 5: Solve for x
    x = 3,982,236,257.31/61,138.10
  6. Step 6: Final answer
    x = 65,135.10

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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.