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Finding the Fourth Proportional to 1,134.64, 1,565.28 and 668.64

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Solution

The fourth proportional to 1,134.64, 1,565.28 and 668.64 is: 922.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.64 : 1,565.28 = 668.64 : x
  2. Step 2: Convert to fraction form
    1,134.64/1,565.28 = 668.64/x
  3. Step 3: Cross multiply
    1,134.64x = 1,565.28 × 668.64
  4. Step 4: Simplify right side
    1,134.64x = 1,046,608.82
  5. Step 5: Solve for x
    x = 1,046,608.82/1,134.64
  6. Step 6: Final answer
    x = 922.41

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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.