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Finding the Fourth Proportional to 1,128.23, 1,557.12 and 734.57

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Solution

The fourth proportional to 1,128.23, 1,557.12 and 734.57 is: 1,013.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.23 : 1,557.12 = 734.57 : x
  2. Step 2: Convert to fraction form
    1,128.23/1,557.12 = 734.57/x
  3. Step 3: Cross multiply
    1,128.23x = 1,557.12 × 734.57
  4. Step 4: Simplify right side
    1,128.23x = 1,143,805.85
  5. Step 5: Solve for x
    x = 1,143,805.85/1,128.23
  6. Step 6: Final answer
    x = 1,013.81

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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.