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Finding the Fourth Proportional to 778.79, 1,168.34 and 340.04

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Solution

The fourth proportional to 778.79, 1,168.34 and 340.04 is: 510.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.79 : 1,168.34 = 340.04 : x
  2. Step 2: Convert to fraction form
    778.79/1,168.34 = 340.04/x
  3. Step 3: Cross multiply
    778.79x = 1,168.34 × 340.04
  4. Step 4: Simplify right side
    778.79x = 397,283.55
  5. Step 5: Solve for x
    x = 397,283.55/778.79
  6. Step 6: Final answer
    x = 510.13

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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.