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Finding the Fourth Proportional to 391.32, 536.04 and 387

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Solution

The fourth proportional to 391.32, 536.04 and 387 is: 530.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.32 : 536.04 = 387 : x
  2. Step 2: Convert to fraction form
    391.32/536.04 = 387/x
  3. Step 3: Cross multiply
    391.32x = 536.04 × 387
  4. Step 4: Simplify right side
    391.32x = 207,447.48
  5. Step 5: Solve for x
    x = 207,447.48/391.32
  6. Step 6: Final answer
    x = 530.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.