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Finding the Fourth Proportional to 285,552.20, 428,328.30 and 261,057.80

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Solution

The fourth proportional to 285,552.20, 428,328.30 and 261,057.80 is: 391,586.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,552.20 : 428,328.30 = 261,057.80 : x
  2. Step 2: Convert to fraction form
    285,552.20/428,328.30 = 261,057.80/x
  3. Step 3: Cross multiply
    285,552.20x = 428,328.30 × 261,057.80
  4. Step 4: Simplify right side
    285,552.20x = 111,818,443,675.74
  5. Step 5: Solve for x
    x = 111,818,443,675.74/285,552.20
  6. Step 6: Final answer
    x = 391,586.70

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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.