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Finding the Fourth Proportional to 774.55, 1,070.58 and 680.59

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Solution

The fourth proportional to 774.55, 1,070.58 and 680.59 is: 940.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.55 : 1,070.58 = 680.59 : x
  2. Step 2: Convert to fraction form
    774.55/1,070.58 = 680.59/x
  3. Step 3: Cross multiply
    774.55x = 1,070.58 × 680.59
  4. Step 4: Simplify right side
    774.55x = 728,626.04
  5. Step 5: Solve for x
    x = 728,626.04/774.55
  6. Step 6: Final answer
    x = 940.71

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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.