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Finding the Fourth Proportional to 436.21, 652.36 and 387.76

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Solution

The fourth proportional to 436.21, 652.36 and 387.76 is: 579.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.21 : 652.36 = 387.76 : x
  2. Step 2: Convert to fraction form
    436.21/652.36 = 387.76/x
  3. Step 3: Cross multiply
    436.21x = 652.36 × 387.76
  4. Step 4: Simplify right side
    436.21x = 252,959.11
  5. Step 5: Solve for x
    x = 252,959.11/436.21
  6. Step 6: Final answer
    x = 579.90

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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.