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Finding the Fourth Proportional to 806.38, 1,209.93 and 477.96

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Solution

The fourth proportional to 806.38, 1,209.93 and 477.96 is: 717.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.38 : 1,209.93 = 477.96 : x
  2. Step 2: Convert to fraction form
    806.38/1,209.93 = 477.96/x
  3. Step 3: Cross multiply
    806.38x = 1,209.93 × 477.96
  4. Step 4: Simplify right side
    806.38x = 578,304.47
  5. Step 5: Solve for x
    x = 578,304.47/806.38
  6. Step 6: Final answer
    x = 717.16

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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.