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Finding the Fourth Proportional to 808.66, 1,115.76 and 559.90

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Solution

The fourth proportional to 808.66, 1,115.76 and 559.90 is: 772.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.66 : 1,115.76 = 559.90 : x
  2. Step 2: Convert to fraction form
    808.66/1,115.76 = 559.90/x
  3. Step 3: Cross multiply
    808.66x = 1,115.76 × 559.90
  4. Step 4: Simplify right side
    808.66x = 624,714.02
  5. Step 5: Solve for x
    x = 624,714.02/808.66
  6. Step 6: Final answer
    x = 772.53

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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.