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Finding the Fourth Proportional to 387.42, 581.22 and 143.94

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Solution

The fourth proportional to 387.42, 581.22 and 143.94 is: 215.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.42 : 581.22 = 143.94 : x
  2. Step 2: Convert to fraction form
    387.42/581.22 = 143.94/x
  3. Step 3: Cross multiply
    387.42x = 581.22 × 143.94
  4. Step 4: Simplify right side
    387.42x = 83,660.81
  5. Step 5: Solve for x
    x = 83,660.81/387.42
  6. Step 6: Final answer
    x = 215.94

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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.