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Finding the Fourth Proportional to 910.79, 1,366.98 and 748.34

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Solution

The fourth proportional to 910.79, 1,366.98 and 748.34 is: 1,123.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.79 : 1,366.98 = 748.34 : x
  2. Step 2: Convert to fraction form
    910.79/1,366.98 = 748.34/x
  3. Step 3: Cross multiply
    910.79x = 1,366.98 × 748.34
  4. Step 4: Simplify right side
    910.79x = 1,022,961.30
  5. Step 5: Solve for x
    x = 1,022,961.30/910.79
  6. Step 6: Final answer
    x = 1,123.15

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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.