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Finding the Fourth Proportional to 690.95, 1,034.30 and 516.60

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Solution

The fourth proportional to 690.95, 1,034.30 and 516.60 is: 773.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.95 : 1,034.30 = 516.60 : x
  2. Step 2: Convert to fraction form
    690.95/1,034.30 = 516.60/x
  3. Step 3: Cross multiply
    690.95x = 1,034.30 × 516.60
  4. Step 4: Simplify right side
    690.95x = 534,320.67
  5. Step 5: Solve for x
    x = 534,320.67/690.95
  6. Step 6: Final answer
    x = 773.31

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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.