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Finding the Fourth Proportional to 60,778.70, 91,128.45 and 54,557.90

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Solution

The fourth proportional to 60,778.70, 91,128.45 and 54,557.90 is: 81,801.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,778.70 : 91,128.45 = 54,557.90 : x
  2. Step 2: Convert to fraction form
    60,778.70/91,128.45 = 54,557.90/x
  3. Step 3: Cross multiply
    60,778.70x = 91,128.45 × 54,557.90
  4. Step 4: Simplify right side
    60,778.70x = 4,971,776,862.26
  5. Step 5: Solve for x
    x = 4,971,776,862.26/60,778.70
  6. Step 6: Final answer
    x = 81,801.30

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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.