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Finding the Fourth Proportional to 867.47, 1,301.81 and 380.66

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Solution

The fourth proportional to 867.47, 1,301.81 and 380.66 is: 571.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.47 : 1,301.81 = 380.66 : x
  2. Step 2: Convert to fraction form
    867.47/1,301.81 = 380.66/x
  3. Step 3: Cross multiply
    867.47x = 1,301.81 × 380.66
  4. Step 4: Simplify right side
    867.47x = 495,546.99
  5. Step 5: Solve for x
    x = 495,546.99/867.47
  6. Step 6: Final answer
    x = 571.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.