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Finding the Fourth Proportional to 80,479.62, 120,713.76 and 21,313.98

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Solution

The fourth proportional to 80,479.62, 120,713.76 and 21,313.98 is: 31,969.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,479.62 : 120,713.76 = 21,313.98 : x
  2. Step 2: Convert to fraction form
    80,479.62/120,713.76 = 21,313.98/x
  3. Step 3: Cross multiply
    80,479.62x = 120,713.76 × 21,313.98
  4. Step 4: Simplify right side
    80,479.62x = 2,572,890,666.36
  5. Step 5: Solve for x
    x = 2,572,890,666.36/80,479.62
  6. Step 6: Final answer
    x = 31,969.47

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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.