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Finding the Fourth Proportional to 89,120.96, 122,978.76 and 51,387.92

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Solution

The fourth proportional to 89,120.96, 122,978.76 and 51,387.92 is: 70,910.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,120.96 : 122,978.76 = 51,387.92 : x
  2. Step 2: Convert to fraction form
    89,120.96/122,978.76 = 51,387.92/x
  3. Step 3: Cross multiply
    89,120.96x = 122,978.76 × 51,387.92
  4. Step 4: Simplify right side
    89,120.96x = 6,319,622,680.58
  5. Step 5: Solve for x
    x = 6,319,622,680.58/89,120.96
  6. Step 6: Final answer
    x = 70,910.62

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1.5x scale

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.