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Finding the Fourth Proportional to 807.82, 1,209 and 499.88

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Solution

The fourth proportional to 807.82, 1,209 and 499.88 is: 748.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.82 : 1,209 = 499.88 : x
  2. Step 2: Convert to fraction form
    807.82/1,209 = 499.88/x
  3. Step 3: Cross multiply
    807.82x = 1,209 × 499.88
  4. Step 4: Simplify right side
    807.82x = 604,354.92
  5. Step 5: Solve for x
    x = 604,354.92/807.82
  6. Step 6: Final answer
    x = 748.13

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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.