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Finding the Fourth Proportional to 387.66, 581.57 and 144.21

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Solution

The fourth proportional to 387.66, 581.57 and 144.21 is: 216.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.66 : 581.57 = 144.21 : x
  2. Step 2: Convert to fraction form
    387.66/581.57 = 144.21/x
  3. Step 3: Cross multiply
    387.66x = 581.57 × 144.21
  4. Step 4: Simplify right side
    387.66x = 83,867.34
  5. Step 5: Solve for x
    x = 83,867.34/387.66
  6. Step 6: Final answer
    x = 216.34

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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.