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Finding the Fourth Proportional to 318,691.22, 439,825.64 and 237,978.61

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Solution

The fourth proportional to 318,691.22, 439,825.64 and 237,978.61 is: 328,434.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,691.22 : 439,825.64 = 237,978.61 : x
  2. Step 2: Convert to fraction form
    318,691.22/439,825.64 = 237,978.61/x
  3. Step 3: Cross multiply
    318,691.22x = 439,825.64 × 237,978.61
  4. Step 4: Simplify right side
    318,691.22x = 104,669,095,594.29
  5. Step 5: Solve for x
    x = 104,669,095,594.29/318,691.22
  6. Step 6: Final answer
    x = 328,434.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.