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Finding the Fourth Proportional to 867.57, 1,301.31 and 218.31

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Solution

The fourth proportional to 867.57, 1,301.31 and 218.31 is: 327.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.57 : 1,301.31 = 218.31 : x
  2. Step 2: Convert to fraction form
    867.57/1,301.31 = 218.31/x
  3. Step 3: Cross multiply
    867.57x = 1,301.31 × 218.31
  4. Step 4: Simplify right side
    867.57x = 284,088.99
  5. Step 5: Solve for x
    x = 284,088.99/867.57
  6. Step 6: Final answer
    x = 327.45

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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.