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Finding the Fourth Proportional to 89,978.64, 124,170.72 and 49,691.66

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Solution

The fourth proportional to 89,978.64, 124,170.72 and 49,691.66 is: 68,574.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,978.64 : 124,170.72 = 49,691.66 : x
  2. Step 2: Convert to fraction form
    89,978.64/124,170.72 = 49,691.66/x
  3. Step 3: Cross multiply
    89,978.64x = 124,170.72 × 49,691.66
  4. Step 4: Simplify right side
    89,978.64x = 6,170,249,200.20
  5. Step 5: Solve for x
    x = 6,170,249,200.20/89,978.64
  6. Step 6: Final answer
    x = 68,574.60

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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.