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Finding the Fourth Proportional to 387.50, 581.24 and 143.88

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Solution

The fourth proportional to 387.50, 581.24 and 143.88 is: 215.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.50 : 581.24 = 143.88 : x
  2. Step 2: Convert to fraction form
    387.50/581.24 = 143.88/x
  3. Step 3: Cross multiply
    387.50x = 581.24 × 143.88
  4. Step 4: Simplify right side
    387.50x = 83,628.81
  5. Step 5: Solve for x
    x = 83,628.81/387.50
  6. Step 6: Final answer
    x = 215.82

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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.