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Finding the Fourth Proportional to 691.47, 951.75 and 611.28

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Solution

The fourth proportional to 691.47, 951.75 and 611.28 is: 841.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.47 : 951.75 = 611.28 : x
  2. Step 2: Convert to fraction form
    691.47/951.75 = 611.28/x
  3. Step 3: Cross multiply
    691.47x = 951.75 × 611.28
  4. Step 4: Simplify right side
    691.47x = 581,785.74
  5. Step 5: Solve for x
    x = 581,785.74/691.47
  6. Step 6: Final answer
    x = 841.38

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Half scale
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Double scale
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1.5x scale

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.