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Finding the Fourth Proportional to 657.68, 981.10 and 611.12

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Solution

The fourth proportional to 657.68, 981.10 and 611.12 is: 911.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.68 : 981.10 = 611.12 : x
  2. Step 2: Convert to fraction form
    657.68/981.10 = 611.12/x
  3. Step 3: Cross multiply
    657.68x = 981.10 × 611.12
  4. Step 4: Simplify right side
    657.68x = 599,569.83
  5. Step 5: Solve for x
    x = 599,569.83/657.68
  6. Step 6: Final answer
    x = 911.64

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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.