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Finding the Fourth Proportional to 779.79, 1,169.89 and 292.88

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Solution

The fourth proportional to 779.79, 1,169.89 and 292.88 is: 439.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.79 : 1,169.89 = 292.88 : x
  2. Step 2: Convert to fraction form
    779.79/1,169.89 = 292.88/x
  3. Step 3: Cross multiply
    779.79x = 1,169.89 × 292.88
  4. Step 4: Simplify right side
    779.79x = 342,637.38
  5. Step 5: Solve for x
    x = 342,637.38/779.79
  6. Step 6: Final answer
    x = 439.40

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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.