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Finding the Fourth Proportional to 80,312.59, 120,459.77 and 21,152.89

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Solution

The fourth proportional to 80,312.59, 120,459.77 and 21,152.89 is: 31,726.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,312.59 : 120,459.77 = 21,152.89 : x
  2. Step 2: Convert to fraction form
    80,312.59/120,459.77 = 21,152.89/x
  3. Step 3: Cross multiply
    80,312.59x = 120,459.77 × 21,152.89
  4. Step 4: Simplify right side
    80,312.59x = 2,548,072,158.47
  5. Step 5: Solve for x
    x = 2,548,072,158.47/80,312.59
  6. Step 6: Final answer
    x = 31,726.93

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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.