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Finding the Fourth Proportional to 769.64, 1,061.62 and 559.55

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Solution

The fourth proportional to 769.64, 1,061.62 and 559.55 is: 771.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.64 : 1,061.62 = 559.55 : x
  2. Step 2: Convert to fraction form
    769.64/1,061.62 = 559.55/x
  3. Step 3: Cross multiply
    769.64x = 1,061.62 × 559.55
  4. Step 4: Simplify right side
    769.64x = 594,030.73
  5. Step 5: Solve for x
    x = 594,030.73/769.64
  6. Step 6: Final answer
    x = 771.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.