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Finding the Fourth Proportional to 438,521.40, 656,469.90 and 391,282.20

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Solution

The fourth proportional to 438,521.40, 656,469.90 and 391,282.20 is: 585,752.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,521.40 : 656,469.90 = 391,282.20 : x
  2. Step 2: Convert to fraction form
    438,521.40/656,469.90 = 391,282.20/x
  3. Step 3: Cross multiply
    438,521.40x = 656,469.90 × 391,282.20
  4. Step 4: Simplify right side
    438,521.40x = 256,864,986,705.78
  5. Step 5: Solve for x
    x = 256,864,986,705.78/438,521.40
  6. Step 6: Final answer
    x = 585,752.46

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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.