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Finding the Fourth Proportional to 780.11, 1,169.43 and 293.06

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Solution

The fourth proportional to 780.11, 1,169.43 and 293.06 is: 439.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.11 : 1,169.43 = 293.06 : x
  2. Step 2: Convert to fraction form
    780.11/1,169.43 = 293.06/x
  3. Step 3: Cross multiply
    780.11x = 1,169.43 × 293.06
  4. Step 4: Simplify right side
    780.11x = 342,713.16
  5. Step 5: Solve for x
    x = 342,713.16/780.11
  6. Step 6: Final answer
    x = 439.31

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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.