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Finding the Fourth Proportional to 917.87, 1,266.03 and 721.04

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Solution

The fourth proportional to 917.87, 1,266.03 and 721.04 is: 994.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.87 : 1,266.03 = 721.04 : x
  2. Step 2: Convert to fraction form
    917.87/1,266.03 = 721.04/x
  3. Step 3: Cross multiply
    917.87x = 1,266.03 × 721.04
  4. Step 4: Simplify right side
    917.87x = 912,851.94
  5. Step 5: Solve for x
    x = 912,851.94/917.87
  6. Step 6: Final answer
    x = 994.54

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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.