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Finding the Fourth Proportional to 808.55, 1,115.41 and 560.21

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Solution

The fourth proportional to 808.55, 1,115.41 and 560.21 is: 772.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.55 : 1,115.41 = 560.21 : x
  2. Step 2: Convert to fraction form
    808.55/1,115.41 = 560.21/x
  3. Step 3: Cross multiply
    808.55x = 1,115.41 × 560.21
  4. Step 4: Simplify right side
    808.55x = 624,863.84
  5. Step 5: Solve for x
    x = 624,863.84/808.55
  6. Step 6: Final answer
    x = 772.82

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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.