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Finding the Fourth Proportional to 40,405.92, 60,479.60 and 21,639.20

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Solution

The fourth proportional to 40,405.92, 60,479.60 and 21,639.20 is: 32,389.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,405.92 : 60,479.60 = 21,639.20 : x
  2. Step 2: Convert to fraction form
    40,405.92/60,479.60 = 21,639.20/x
  3. Step 3: Cross multiply
    40,405.92x = 60,479.60 × 21,639.20
  4. Step 4: Simplify right side
    40,405.92x = 1,308,730,160.32
  5. Step 5: Solve for x
    x = 1,308,730,160.32/40,405.92
  6. Step 6: Final answer
    x = 32,389.56

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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.