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Finding the Fourth Proportional to 910.17, 1,257.05 and 811.76

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Solution

The fourth proportional to 910.17, 1,257.05 and 811.76 is: 1,121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.17 : 1,257.05 = 811.76 : x
  2. Step 2: Convert to fraction form
    910.17/1,257.05 = 811.76/x
  3. Step 3: Cross multiply
    910.17x = 1,257.05 × 811.76
  4. Step 4: Simplify right side
    910.17x = 1,020,418.65
  5. Step 5: Solve for x
    x = 1,020,418.65/910.17
  6. Step 6: Final answer
    x = 1,121.13

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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.