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Finding the Fourth Proportional to 828.47, 1,242.62 and 438.32

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Solution

The fourth proportional to 828.47, 1,242.62 and 438.32 is: 657.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.47 : 1,242.62 = 438.32 : x
  2. Step 2: Convert to fraction form
    828.47/1,242.62 = 438.32/x
  3. Step 3: Cross multiply
    828.47x = 1,242.62 × 438.32
  4. Step 4: Simplify right side
    828.47x = 544,656.79
  5. Step 5: Solve for x
    x = 544,656.79/828.47
  6. Step 6: Final answer
    x = 657.43

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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.