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Finding the Fourth Proportional to 933.78, 1,288.18 and 560.11

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Solution

The fourth proportional to 933.78, 1,288.18 and 560.11 is: 772.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.78 : 1,288.18 = 560.11 : x
  2. Step 2: Convert to fraction form
    933.78/1,288.18 = 560.11/x
  3. Step 3: Cross multiply
    933.78x = 1,288.18 × 560.11
  4. Step 4: Simplify right side
    933.78x = 721,517.88
  5. Step 5: Solve for x
    x = 721,517.88/933.78
  6. Step 6: Final answer
    x = 772.69

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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.