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Finding the Fourth Proportional to 700.85, 1,051.31 and 515.97

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Solution

The fourth proportional to 700.85, 1,051.31 and 515.97 is: 773.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.85 : 1,051.31 = 515.97 : x
  2. Step 2: Convert to fraction form
    700.85/1,051.31 = 515.97/x
  3. Step 3: Cross multiply
    700.85x = 1,051.31 × 515.97
  4. Step 4: Simplify right side
    700.85x = 542,445.71
  5. Step 5: Solve for x
    x = 542,445.71/700.85
  6. Step 6: Final answer
    x = 773.98

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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.