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Finding the Fourth Proportional to 81,240.64, 112,124.88 and 49,419.52

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Solution

The fourth proportional to 81,240.64, 112,124.88 and 49,419.52 is: 68,206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,240.64 : 112,124.88 = 49,419.52 : x
  2. Step 2: Convert to fraction form
    81,240.64/112,124.88 = 49,419.52/x
  3. Step 3: Cross multiply
    81,240.64x = 112,124.88 × 49,419.52
  4. Step 4: Simplify right side
    81,240.64x = 5,541,157,749.66
  5. Step 5: Solve for x
    x = 5,541,157,749.66/81,240.64
  6. Step 6: Final answer
    x = 68,206.72

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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.