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Finding the Fourth Proportional to 57,717.90, 86,439.15 and 28,040.40

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Solution

The fourth proportional to 57,717.90, 86,439.15 and 28,040.40 is: 41,993.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,717.90 : 86,439.15 = 28,040.40 : x
  2. Step 2: Convert to fraction form
    57,717.90/86,439.15 = 28,040.40/x
  3. Step 3: Cross multiply
    57,717.90x = 86,439.15 × 28,040.40
  4. Step 4: Simplify right side
    57,717.90x = 2,423,788,341.66
  5. Step 5: Solve for x
    x = 2,423,788,341.66/57,717.90
  6. Step 6: Final answer
    x = 41,993.70

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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.