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Finding the Fourth Proportional to 80,482.70, 120,726.34 and 21,318.38

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Solution

The fourth proportional to 80,482.70, 120,726.34 and 21,318.38 is: 31,978.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,482.70 : 120,726.34 = 21,318.38 : x
  2. Step 2: Convert to fraction form
    80,482.70/120,726.34 = 21,318.38/x
  3. Step 3: Cross multiply
    80,482.70x = 120,726.34 × 21,318.38
  4. Step 4: Simplify right side
    80,482.70x = 2,573,689,787.93
  5. Step 5: Solve for x
    x = 2,573,689,787.93/80,482.70
  6. Step 6: Final answer
    x = 31,978.17

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1.5x scale

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.