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Finding the Fourth Proportional to 486.89, 672.14 and 312.34

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Solution

The fourth proportional to 486.89, 672.14 and 312.34 is: 431.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.89 : 672.14 = 312.34 : x
  2. Step 2: Convert to fraction form
    486.89/672.14 = 312.34/x
  3. Step 3: Cross multiply
    486.89x = 672.14 × 312.34
  4. Step 4: Simplify right side
    486.89x = 209,936.21
  5. Step 5: Solve for x
    x = 209,936.21/486.89
  6. Step 6: Final answer
    x = 431.18

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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.