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Finding the Fourth Proportional to 491.92, 678.90 and 317.24

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Solution

The fourth proportional to 491.92, 678.90 and 317.24 is: 437.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.92 : 678.90 = 317.24 : x
  2. Step 2: Convert to fraction form
    491.92/678.90 = 317.24/x
  3. Step 3: Cross multiply
    491.92x = 678.90 × 317.24
  4. Step 4: Simplify right side
    491.92x = 215,374.24
  5. Step 5: Solve for x
    x = 215,374.24/491.92
  6. Step 6: Final answer
    x = 437.82

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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.