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Finding the Fourth Proportional to 426,048.80, 639,073.20 and 215,659.40

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Solution

The fourth proportional to 426,048.80, 639,073.20 and 215,659.40 is: 323,489.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,048.80 : 639,073.20 = 215,659.40 : x
  2. Step 2: Convert to fraction form
    426,048.80/639,073.20 = 215,659.40/x
  3. Step 3: Cross multiply
    426,048.80x = 639,073.20 × 215,659.40
  4. Step 4: Simplify right side
    426,048.80x = 137,822,142,868.08
  5. Step 5: Solve for x
    x = 137,822,142,868.08/426,048.80
  6. Step 6: Final answer
    x = 323,489.10

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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.