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Finding the Fourth Proportional to 1,129.26, 1,558.56 and 663.54

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Solution

The fourth proportional to 1,129.26, 1,558.56 and 663.54 is: 915.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.26 : 1,558.56 = 663.54 : x
  2. Step 2: Convert to fraction form
    1,129.26/1,558.56 = 663.54/x
  3. Step 3: Cross multiply
    1,129.26x = 1,558.56 × 663.54
  4. Step 4: Simplify right side
    1,129.26x = 1,034,166.90
  5. Step 5: Solve for x
    x = 1,034,166.90/1,129.26
  6. Step 6: Final answer
    x = 915.79

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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.