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Finding the Fourth Proportional to 81,398.40, 122,079.15 and 28,807.89

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Solution

The fourth proportional to 81,398.40, 122,079.15 and 28,807.89 is: 43,205.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,398.40 : 122,079.15 = 28,807.89 : x
  2. Step 2: Convert to fraction form
    81,398.40/122,079.15 = 28,807.89/x
  3. Step 3: Cross multiply
    81,398.40x = 122,079.15 × 28,807.89
  4. Step 4: Simplify right side
    81,398.40x = 3,516,842,724.49
  5. Step 5: Solve for x
    x = 3,516,842,724.49/81,398.40
  6. Step 6: Final answer
    x = 43,205.31

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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.