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Finding the Fourth Proportional to 933.09, 1,287.87 and 560.40

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Solution

The fourth proportional to 933.09, 1,287.87 and 560.40 is: 773.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.09 : 1,287.87 = 560.40 : x
  2. Step 2: Convert to fraction form
    933.09/1,287.87 = 560.40/x
  3. Step 3: Cross multiply
    933.09x = 1,287.87 × 560.40
  4. Step 4: Simplify right side
    933.09x = 721,722.35
  5. Step 5: Solve for x
    x = 721,722.35/933.09
  6. Step 6: Final answer
    x = 773.48

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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.