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Finding the Fourth Proportional to 841.28, 1,159.94 and 691.38

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Solution

The fourth proportional to 841.28, 1,159.94 and 691.38 is: 953.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.28 : 1,159.94 = 691.38 : x
  2. Step 2: Convert to fraction form
    841.28/1,159.94 = 691.38/x
  3. Step 3: Cross multiply
    841.28x = 1,159.94 × 691.38
  4. Step 4: Simplify right side
    841.28x = 801,961.05
  5. Step 5: Solve for x
    x = 801,961.05/841.28
  6. Step 6: Final answer
    x = 953.27

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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.