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Finding the Fourth Proportional to 90,871.88, 136,313.27 and 28,542.38

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Solution

The fourth proportional to 90,871.88, 136,313.27 and 28,542.38 is: 42,815.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,871.88 : 136,313.27 = 28,542.38 : x
  2. Step 2: Convert to fraction form
    90,871.88/136,313.27 = 28,542.38/x
  3. Step 3: Cross multiply
    90,871.88x = 136,313.27 × 28,542.38
  4. Step 4: Simplify right side
    90,871.88x = 3,890,705,008.67
  5. Step 5: Solve for x
    x = 3,890,705,008.67/90,871.88
  6. Step 6: Final answer
    x = 42,815.28

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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.