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Finding the Fourth Proportional to 778.13, 1,166.95 and 258.04

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Solution

The fourth proportional to 778.13, 1,166.95 and 258.04 is: 386.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.13 : 1,166.95 = 258.04 : x
  2. Step 2: Convert to fraction form
    778.13/1,166.95 = 258.04/x
  3. Step 3: Cross multiply
    778.13x = 1,166.95 × 258.04
  4. Step 4: Simplify right side
    778.13x = 301,119.78
  5. Step 5: Solve for x
    x = 301,119.78/778.13
  6. Step 6: Final answer
    x = 386.98

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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.