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Finding the Fourth Proportional to 438,421.60, 656,320.20 and 412,469.20

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Solution

The fourth proportional to 438,421.60, 656,320.20 and 412,469.20 is: 617,469.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,421.60 : 656,320.20 = 412,469.20 : x
  2. Step 2: Convert to fraction form
    438,421.60/656,320.20 = 412,469.20/x
  3. Step 3: Cross multiply
    438,421.60x = 656,320.20 × 412,469.20
  4. Step 4: Simplify right side
    438,421.60x = 270,711,867,837.84
  5. Step 5: Solve for x
    x = 270,711,867,837.84/438,421.60
  6. Step 6: Final answer
    x = 617,469.28

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1.5x scale

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.