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Finding the Fourth Proportional to 487.13, 672.13 and 312.44

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Solution

The fourth proportional to 487.13, 672.13 and 312.44 is: 431.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.13 : 672.13 = 312.44 : x
  2. Step 2: Convert to fraction form
    487.13/672.13 = 312.44/x
  3. Step 3: Cross multiply
    487.13x = 672.13 × 312.44
  4. Step 4: Simplify right side
    487.13x = 210,000.30
  5. Step 5: Solve for x
    x = 210,000.30/487.13
  6. Step 6: Final answer
    x = 431.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.