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Finding the Fourth Proportional to 492.32, 679.28 and 317.76

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Solution

The fourth proportional to 492.32, 679.28 and 317.76 is: 438.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.32 : 679.28 = 317.76 : x
  2. Step 2: Convert to fraction form
    492.32/679.28 = 317.76/x
  3. Step 3: Cross multiply
    492.32x = 679.28 × 317.76
  4. Step 4: Simplify right side
    492.32x = 215,848.01
  5. Step 5: Solve for x
    x = 215,848.01/492.32
  6. Step 6: Final answer
    x = 438.43

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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.