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Finding the Fourth Proportional to 974.78, 1,469.43 and 911.30

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Solution

The fourth proportional to 974.78, 1,469.43 and 911.30 is: 1,373.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.78 : 1,469.43 = 911.30 : x
  2. Step 2: Convert to fraction form
    974.78/1,469.43 = 911.30/x
  3. Step 3: Cross multiply
    974.78x = 1,469.43 × 911.30
  4. Step 4: Simplify right side
    974.78x = 1,339,084.21
  5. Step 5: Solve for x
    x = 1,339,084.21/974.78
  6. Step 6: Final answer
    x = 1,373.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.