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Finding the Fourth Proportional to 425,521.80, 638,282.70 and 215,132.40

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Solution

The fourth proportional to 425,521.80, 638,282.70 and 215,132.40 is: 322,698.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,521.80 : 638,282.70 = 215,132.40 : x
  2. Step 2: Convert to fraction form
    425,521.80/638,282.70 = 215,132.40/x
  3. Step 3: Cross multiply
    425,521.80x = 638,282.70 × 215,132.40
  4. Step 4: Simplify right side
    425,521.80x = 137,315,289,129.48
  5. Step 5: Solve for x
    x = 137,315,289,129.48/425,521.80
  6. Step 6: Final answer
    x = 322,698.60

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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.