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Finding the Fourth Proportional to 801.78, 1,199.70 and 493.80

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Solution

The fourth proportional to 801.78, 1,199.70 and 493.80 is: 738.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.78 : 1,199.70 = 493.80 : x
  2. Step 2: Convert to fraction form
    801.78/1,199.70 = 493.80/x
  3. Step 3: Cross multiply
    801.78x = 1,199.70 × 493.80
  4. Step 4: Simplify right side
    801.78x = 592,411.86
  5. Step 5: Solve for x
    x = 592,411.86/801.78
  6. Step 6: Final answer
    x = 738.87

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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.