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Finding the Fourth Proportional to 387.86, 581.43 and 144.21

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Solution

The fourth proportional to 387.86, 581.43 and 144.21 is: 216.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.86 : 581.43 = 144.21 : x
  2. Step 2: Convert to fraction form
    387.86/581.43 = 144.21/x
  3. Step 3: Cross multiply
    387.86x = 581.43 × 144.21
  4. Step 4: Simplify right side
    387.86x = 83,848.02
  5. Step 5: Solve for x
    x = 83,848.02/387.86
  6. Step 6: Final answer
    x = 216.18

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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.