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Finding the Fourth Proportional to 387.48, 581.08 and 144

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Solution

The fourth proportional to 387.48, 581.08 and 144 is: 215.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.48 : 581.08 = 144 : x
  2. Step 2: Convert to fraction form
    387.48/581.08 = 144/x
  3. Step 3: Cross multiply
    387.48x = 581.08 × 144
  4. Step 4: Simplify right side
    387.48x = 83,675.52
  5. Step 5: Solve for x
    x = 83,675.52/387.48
  6. Step 6: Final answer
    x = 215.95

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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.