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Finding the Fourth Proportional to 221,445.20, 332,167.80 and 212,697.20

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Solution

The fourth proportional to 221,445.20, 332,167.80 and 212,697.20 is: 319,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,445.20 : 332,167.80 = 212,697.20 : x
  2. Step 2: Convert to fraction form
    221,445.20/332,167.80 = 212,697.20/x
  3. Step 3: Cross multiply
    221,445.20x = 332,167.80 × 212,697.20
  4. Step 4: Simplify right side
    221,445.20x = 70,651,160,990.16
  5. Step 5: Solve for x
    x = 70,651,160,990.16/221,445.20
  6. Step 6: Final answer
    x = 319,045.80

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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.