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Finding the Fourth Proportional to 750.61, 1,120.49 and 648.55

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Solution

The fourth proportional to 750.61, 1,120.49 and 648.55 is: 968.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.61 : 1,120.49 = 648.55 : x
  2. Step 2: Convert to fraction form
    750.61/1,120.49 = 648.55/x
  3. Step 3: Cross multiply
    750.61x = 1,120.49 × 648.55
  4. Step 4: Simplify right side
    750.61x = 726,693.79
  5. Step 5: Solve for x
    x = 726,693.79/750.61
  6. Step 6: Final answer
    x = 968.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.