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Finding the Fourth Proportional to 387.38, 581.13 and 222.86

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Solution

The fourth proportional to 387.38, 581.13 and 222.86 is: 334.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 581.13 = 222.86 : x
  2. Step 2: Convert to fraction form
    387.38/581.13 = 222.86/x
  3. Step 3: Cross multiply
    387.38x = 581.13 × 222.86
  4. Step 4: Simplify right side
    387.38x = 129,510.63
  5. Step 5: Solve for x
    x = 129,510.63/387.38
  6. Step 6: Final answer
    x = 334.32

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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.