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Finding the Fourth Proportional to 80,342.40, 120,643.20 and 60,643.20

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Solution

The fourth proportional to 80,342.40, 120,643.20 and 60,643.20 is: 91,062.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,342.40 : 120,643.20 = 60,643.20 : x
  2. Step 2: Convert to fraction form
    80,342.40/120,643.20 = 60,643.20/x
  3. Step 3: Cross multiply
    80,342.40x = 120,643.20 × 60,643.20
  4. Step 4: Simplify right side
    80,342.40x = 7,316,189,706.24
  5. Step 5: Solve for x
    x = 7,316,189,706.24/80,342.40
  6. Step 6: Final answer
    x = 91,062.62

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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.