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Finding the Fourth Proportional to 910.73, 1,255.53 and 770.28

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Solution

The fourth proportional to 910.73, 1,255.53 and 770.28 is: 1,061.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.73 : 1,255.53 = 770.28 : x
  2. Step 2: Convert to fraction form
    910.73/1,255.53 = 770.28/x
  3. Step 3: Cross multiply
    910.73x = 1,255.53 × 770.28
  4. Step 4: Simplify right side
    910.73x = 967,109.65
  5. Step 5: Solve for x
    x = 967,109.65/910.73
  6. Step 6: Final answer
    x = 1,061.91

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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.