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Finding the Fourth Proportional to 766.90, 1,151.70 and 561.70

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Solution

The fourth proportional to 766.90, 1,151.70 and 561.70 is: 843.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.90 : 1,151.70 = 561.70 : x
  2. Step 2: Convert to fraction form
    766.90/1,151.70 = 561.70/x
  3. Step 3: Cross multiply
    766.90x = 1,151.70 × 561.70
  4. Step 4: Simplify right side
    766.90x = 646,909.89
  5. Step 5: Solve for x
    x = 646,909.89/766.90
  6. Step 6: Final answer
    x = 843.54

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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.