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Finding the Fourth Proportional to 61,387.65, 91,539.30 and 53,921.76

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Solution

The fourth proportional to 61,387.65, 91,539.30 and 53,921.76 is: 80,406.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,387.65 : 91,539.30 = 53,921.76 : x
  2. Step 2: Convert to fraction form
    61,387.65/91,539.30 = 53,921.76/x
  3. Step 3: Cross multiply
    61,387.65x = 91,539.30 × 53,921.76
  4. Step 4: Simplify right side
    61,387.65x = 4,935,960,165.17
  5. Step 5: Solve for x
    x = 4,935,960,165.17/61,387.65
  6. Step 6: Final answer
    x = 80,406.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.