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Finding the Fourth Proportional to 780.30, 1,169.07 and 663.66

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Solution

The fourth proportional to 780.30, 1,169.07 and 663.66 is: 994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.30 : 1,169.07 = 663.66 : x
  2. Step 2: Convert to fraction form
    780.30/1,169.07 = 663.66/x
  3. Step 3: Cross multiply
    780.30x = 1,169.07 × 663.66
  4. Step 4: Simplify right side
    780.30x = 775,865.00
  5. Step 5: Solve for x
    x = 775,865.00/780.30
  6. Step 6: Final answer
    x = 994.32

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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.