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Finding the Fourth Proportional to 84,557.79, 126,807.21 and 28,385.91

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Solution

The fourth proportional to 84,557.79, 126,807.21 and 28,385.91 is: 42,568.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,557.79 : 126,807.21 = 28,385.91 : x
  2. Step 2: Convert to fraction form
    84,557.79/126,807.21 = 28,385.91/x
  3. Step 3: Cross multiply
    84,557.79x = 126,807.21 × 28,385.91
  4. Step 4: Simplify right side
    84,557.79x = 3,599,538,050.41
  5. Step 5: Solve for x
    x = 3,599,538,050.41/84,557.79
  6. Step 6: Final answer
    x = 42,568.97

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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.