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Finding the Fourth Proportional to 382.16, 572.89 and 138.63

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Solution

The fourth proportional to 382.16, 572.89 and 138.63 is: 207.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.16 : 572.89 = 138.63 : x
  2. Step 2: Convert to fraction form
    382.16/572.89 = 138.63/x
  3. Step 3: Cross multiply
    382.16x = 572.89 × 138.63
  4. Step 4: Simplify right side
    382.16x = 79,417.77
  5. Step 5: Solve for x
    x = 79,417.77/382.16
  6. Step 6: Final answer
    x = 207.82

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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.