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Finding the Fourth Proportional to 272,143.20, 408,214.80 and 138,979.20

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Solution

The fourth proportional to 272,143.20, 408,214.80 and 138,979.20 is: 208,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,143.20 : 408,214.80 = 138,979.20 : x
  2. Step 2: Convert to fraction form
    272,143.20/408,214.80 = 138,979.20/x
  3. Step 3: Cross multiply
    272,143.20x = 408,214.80 × 138,979.20
  4. Step 4: Simplify right side
    272,143.20x = 56,733,366,332.16
  5. Step 5: Solve for x
    x = 56,733,366,332.16/272,143.20
  6. Step 6: Final answer
    x = 208,468.80

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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.