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Finding the Fourth Proportional to 828.52, 1,242.80 and 462.40

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Solution

The fourth proportional to 828.52, 1,242.80 and 462.40 is: 693.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.52 : 1,242.80 = 462.40 : x
  2. Step 2: Convert to fraction form
    828.52/1,242.80 = 462.40/x
  3. Step 3: Cross multiply
    828.52x = 1,242.80 × 462.40
  4. Step 4: Simplify right side
    828.52x = 574,670.72
  5. Step 5: Solve for x
    x = 574,670.72/828.52
  6. Step 6: Final answer
    x = 693.61

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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.