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Finding the Fourth Proportional to 81,437.40, 122,484.15 and 72,908.10

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Solution

The fourth proportional to 81,437.40, 122,484.15 and 72,908.10 is: 109,655.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,437.40 : 122,484.15 = 72,908.10 : x
  2. Step 2: Convert to fraction form
    81,437.40/122,484.15 = 72,908.10/x
  3. Step 3: Cross multiply
    81,437.40x = 122,484.15 × 72,908.10
  4. Step 4: Simplify right side
    81,437.40x = 8,930,086,656.62
  5. Step 5: Solve for x
    x = 8,930,086,656.62/81,437.40
  6. Step 6: Final answer
    x = 109,655.84

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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.