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Finding the Fourth Proportional to 808.26, 1,115.40 and 476.70

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Solution

The fourth proportional to 808.26, 1,115.40 and 476.70 is: 657.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.26 : 1,115.40 = 476.70 : x
  2. Step 2: Convert to fraction form
    808.26/1,115.40 = 476.70/x
  3. Step 3: Cross multiply
    808.26x = 1,115.40 × 476.70
  4. Step 4: Simplify right side
    808.26x = 531,711.18
  5. Step 5: Solve for x
    x = 531,711.18/808.26
  6. Step 6: Final answer
    x = 657.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.