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Finding the Fourth Proportional to 1,128.56, 1,691.85 and 580.46

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Solution

The fourth proportional to 1,128.56, 1,691.85 and 580.46 is: 870.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.56 : 1,691.85 = 580.46 : x
  2. Step 2: Convert to fraction form
    1,128.56/1,691.85 = 580.46/x
  3. Step 3: Cross multiply
    1,128.56x = 1,691.85 × 580.46
  4. Step 4: Simplify right side
    1,128.56x = 982,051.25
  5. Step 5: Solve for x
    x = 982,051.25/1,128.56
  6. Step 6: Final answer
    x = 870.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.