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Finding the Fourth Proportional to 828.18, 1,242.09 and 611.10

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Solution

The fourth proportional to 828.18, 1,242.09 and 611.10 is: 916.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.18 : 1,242.09 = 611.10 : x
  2. Step 2: Convert to fraction form
    828.18/1,242.09 = 611.10/x
  3. Step 3: Cross multiply
    828.18x = 1,242.09 × 611.10
  4. Step 4: Simplify right side
    828.18x = 759,041.20
  5. Step 5: Solve for x
    x = 759,041.20/828.18
  6. Step 6: Final answer
    x = 916.52

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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.