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Finding the Fourth Proportional to 1,125.78, 1,553.52 and 660

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Solution

The fourth proportional to 1,125.78, 1,553.52 and 660 is: 910.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.78 : 1,553.52 = 660 : x
  2. Step 2: Convert to fraction form
    1,125.78/1,553.52 = 660/x
  3. Step 3: Cross multiply
    1,125.78x = 1,553.52 × 660
  4. Step 4: Simplify right side
    1,125.78x = 1,025,323.20
  5. Step 5: Solve for x
    x = 1,025,323.20/1,125.78
  6. Step 6: Final answer
    x = 910.77

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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.