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Finding the Fourth Proportional to 828.60, 1,240.46 and 654.04

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Solution

The fourth proportional to 828.60, 1,240.46 and 654.04 is: 979.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.60 : 1,240.46 = 654.04 : x
  2. Step 2: Convert to fraction form
    828.60/1,240.46 = 654.04/x
  3. Step 3: Cross multiply
    828.60x = 1,240.46 × 654.04
  4. Step 4: Simplify right side
    828.60x = 811,310.46
  5. Step 5: Solve for x
    x = 811,310.46/828.60
  6. Step 6: Final answer
    x = 979.13

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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.