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Finding the Fourth Proportional to 80,264.72, 120,400.80 and 21,106.40

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Solution

The fourth proportional to 80,264.72, 120,400.80 and 21,106.40 is: 31,660.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,264.72 : 120,400.80 = 21,106.40 : x
  2. Step 2: Convert to fraction form
    80,264.72/120,400.80 = 21,106.40/x
  3. Step 3: Cross multiply
    80,264.72x = 120,400.80 × 21,106.40
  4. Step 4: Simplify right side
    80,264.72x = 2,541,227,445.12
  5. Step 5: Solve for x
    x = 2,541,227,445.12/80,264.72
  6. Step 6: Final answer
    x = 31,660.58

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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.