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Finding the Fourth Proportional to 779.92, 1,170.18 and 318.04

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Solution

The fourth proportional to 779.92, 1,170.18 and 318.04 is: 477.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.92 : 1,170.18 = 318.04 : x
  2. Step 2: Convert to fraction form
    779.92/1,170.18 = 318.04/x
  3. Step 3: Cross multiply
    779.92x = 1,170.18 × 318.04
  4. Step 4: Simplify right side
    779.92x = 372,164.05
  5. Step 5: Solve for x
    x = 372,164.05/779.92
  6. Step 6: Final answer
    x = 477.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.