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Finding the Fourth Proportional to 1,120.31, 1,545.68 and 648.15

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Solution

The fourth proportional to 1,120.31, 1,545.68 and 648.15 is: 894.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.31 : 1,545.68 = 648.15 : x
  2. Step 2: Convert to fraction form
    1,120.31/1,545.68 = 648.15/x
  3. Step 3: Cross multiply
    1,120.31x = 1,545.68 × 648.15
  4. Step 4: Simplify right side
    1,120.31x = 1,001,829.25
  5. Step 5: Solve for x
    x = 1,001,829.25/1,120.31
  6. Step 6: Final answer
    x = 894.25

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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.