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Finding the Fourth Proportional to 426,439.92, 639,424.56 and 173,655.60

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Solution

The fourth proportional to 426,439.92, 639,424.56 and 173,655.60 is: 260,387.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,439.92 : 639,424.56 = 173,655.60 : x
  2. Step 2: Convert to fraction form
    426,439.92/639,424.56 = 173,655.60/x
  3. Step 3: Cross multiply
    426,439.92x = 639,424.56 × 173,655.60
  4. Step 4: Simplify right side
    426,439.92x = 111,039,655,621.54
  5. Step 5: Solve for x
    x = 111,039,655,621.54/426,439.92
  6. Step 6: Final answer
    x = 260,387.57

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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.