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Finding the Fourth Proportional to 89,929.20, 124,152 and 54,128

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Solution

The fourth proportional to 89,929.20, 124,152 and 54,128 is: 74,726.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,929.20 : 124,152 = 54,128 : x
  2. Step 2: Convert to fraction form
    89,929.20/124,152 = 54,128/x
  3. Step 3: Cross multiply
    89,929.20x = 124,152 × 54,128
  4. Step 4: Simplify right side
    89,929.20x = 6,720,099,456
  5. Step 5: Solve for x
    x = 6,720,099,456/89,929.20
  6. Step 6: Final answer
    x = 74,726.56

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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.