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Finding the Fourth Proportional to 81,263.52, 121,914.72 and 28,658.88

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Solution

The fourth proportional to 81,263.52, 121,914.72 and 28,658.88 is: 42,995.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,263.52 : 121,914.72 = 28,658.88 : x
  2. Step 2: Convert to fraction form
    81,263.52/121,914.72 = 28,658.88/x
  3. Step 3: Cross multiply
    81,263.52x = 121,914.72 × 28,658.88
  4. Step 4: Simplify right side
    81,263.52x = 3,493,939,330.71
  5. Step 5: Solve for x
    x = 3,493,939,330.71/81,263.52
  6. Step 6: Final answer
    x = 42,995.18

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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.