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Finding the Fourth Proportional to 867.81, 1,308.17 and 811.38

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Solution

The fourth proportional to 867.81, 1,308.17 and 811.38 is: 1,223.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.81 : 1,308.17 = 811.38 : x
  2. Step 2: Convert to fraction form
    867.81/1,308.17 = 811.38/x
  3. Step 3: Cross multiply
    867.81x = 1,308.17 × 811.38
  4. Step 4: Simplify right side
    867.81x = 1,061,422.97
  5. Step 5: Solve for x
    x = 1,061,422.97/867.81
  6. Step 6: Final answer
    x = 1,223.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.