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Finding the Fourth Proportional to 1,002.81, 1,383.75 and 560.64

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Solution

The fourth proportional to 1,002.81, 1,383.75 and 560.64 is: 773.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.81 : 1,383.75 = 560.64 : x
  2. Step 2: Convert to fraction form
    1,002.81/1,383.75 = 560.64/x
  3. Step 3: Cross multiply
    1,002.81x = 1,383.75 × 560.64
  4. Step 4: Simplify right side
    1,002.81x = 775,785.60
  5. Step 5: Solve for x
    x = 775,785.60/1,002.81
  6. Step 6: Final answer
    x = 773.61

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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.