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Finding the Fourth Proportional to 828.65, 1,242.99 and 613.59

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Solution

The fourth proportional to 828.65, 1,242.99 and 613.59 is: 920.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.65 : 1,242.99 = 613.59 : x
  2. Step 2: Convert to fraction form
    828.65/1,242.99 = 613.59/x
  3. Step 3: Cross multiply
    828.65x = 1,242.99 × 613.59
  4. Step 4: Simplify right side
    828.65x = 762,686.23
  5. Step 5: Solve for x
    x = 762,686.23/828.65
  6. Step 6: Final answer
    x = 920.40

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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.