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Finding the Fourth Proportional to 491.92, 678.54 and 374.20

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Solution

The fourth proportional to 491.92, 678.54 and 374.20 is: 516.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.92 : 678.54 = 374.20 : x
  2. Step 2: Convert to fraction form
    491.92/678.54 = 374.20/x
  3. Step 3: Cross multiply
    491.92x = 678.54 × 374.20
  4. Step 4: Simplify right side
    491.92x = 253,909.67
  5. Step 5: Solve for x
    x = 253,909.67/491.92
  6. Step 6: Final answer
    x = 516.16

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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.