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Finding the Fourth Proportional to 64,972.90, 89,462.73 and 55,391.41

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Solution

The fourth proportional to 64,972.90, 89,462.73 and 55,391.41 is: 76,269.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,972.90 : 89,462.73 = 55,391.41 : x
  2. Step 2: Convert to fraction form
    64,972.90/89,462.73 = 55,391.41/x
  3. Step 3: Cross multiply
    64,972.90x = 89,462.73 × 55,391.41
  4. Step 4: Simplify right side
    64,972.90x = 4,955,466,757.15
  5. Step 5: Solve for x
    x = 4,955,466,757.15/64,972.90
  6. Step 6: Final answer
    x = 76,269.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.