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Finding the Fourth Proportional to 808.71, 1,115.42 and 509.66

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Solution

The fourth proportional to 808.71, 1,115.42 and 509.66 is: 702.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.71 : 1,115.42 = 509.66 : x
  2. Step 2: Convert to fraction form
    808.71/1,115.42 = 509.66/x
  3. Step 3: Cross multiply
    808.71x = 1,115.42 × 509.66
  4. Step 4: Simplify right side
    808.71x = 568,476.83
  5. Step 5: Solve for x
    x = 568,476.83/808.71
  6. Step 6: Final answer
    x = 702.94

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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.