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Finding the Fourth Proportional to 81,045.20, 121,567.80 and 57,425.60

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Solution

The fourth proportional to 81,045.20, 121,567.80 and 57,425.60 is: 86,138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,045.20 : 121,567.80 = 57,425.60 : x
  2. Step 2: Convert to fraction form
    81,045.20/121,567.80 = 57,425.60/x
  3. Step 3: Cross multiply
    81,045.20x = 121,567.80 × 57,425.60
  4. Step 4: Simplify right side
    81,045.20x = 6,981,103,855.68
  5. Step 5: Solve for x
    x = 6,981,103,855.68/81,045.20
  6. Step 6: Final answer
    x = 86,138.40

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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.