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Finding the Fourth Proportional to 1,126.64, 1,554.88 and 660.88

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Solution

The fourth proportional to 1,126.64, 1,554.88 and 660.88 is: 912.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.64 : 1,554.88 = 660.88 : x
  2. Step 2: Convert to fraction form
    1,126.64/1,554.88 = 660.88/x
  3. Step 3: Cross multiply
    1,126.64x = 1,554.88 × 660.88
  4. Step 4: Simplify right side
    1,126.64x = 1,027,589.09
  5. Step 5: Solve for x
    x = 1,027,589.09/1,126.64
  6. Step 6: Final answer
    x = 912.08

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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.