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Finding the Fourth Proportional to 866.38, 1,291.21 and 865.01

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Solution

The fourth proportional to 866.38, 1,291.21 and 865.01 is: 1,289.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.38 : 1,291.21 = 865.01 : x
  2. Step 2: Convert to fraction form
    866.38/1,291.21 = 865.01/x
  3. Step 3: Cross multiply
    866.38x = 1,291.21 × 865.01
  4. Step 4: Simplify right side
    866.38x = 1,116,909.56
  5. Step 5: Solve for x
    x = 1,116,909.56/866.38
  6. Step 6: Final answer
    x = 1,289.17

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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.