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Finding the Fourth Proportional to 908.73, 1,255.10 and 661.16

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Solution

The fourth proportional to 908.73, 1,255.10 and 661.16 is: 913.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.73 : 1,255.10 = 661.16 : x
  2. Step 2: Convert to fraction form
    908.73/1,255.10 = 661.16/x
  3. Step 3: Cross multiply
    908.73x = 1,255.10 × 661.16
  4. Step 4: Simplify right side
    908.73x = 829,812.33
  5. Step 5: Solve for x
    x = 829,812.33/908.73
  6. Step 6: Final answer
    x = 913.16

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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.