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Finding the Fourth Proportional to 770.74, 1,062.90 and 613.89

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Solution

The fourth proportional to 770.74, 1,062.90 and 613.89 is: 846.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.74 : 1,062.90 = 613.89 : x
  2. Step 2: Convert to fraction form
    770.74/1,062.90 = 613.89/x
  3. Step 3: Cross multiply
    770.74x = 1,062.90 × 613.89
  4. Step 4: Simplify right side
    770.74x = 652,503.68
  5. Step 5: Solve for x
    x = 652,503.68/770.74
  6. Step 6: Final answer
    x = 846.59

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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.