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Finding the Fourth Proportional to 306,625.12, 423,142.56 and 172,489.12

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Solution

The fourth proportional to 306,625.12, 423,142.56 and 172,489.12 is: 238,034.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,625.12 : 423,142.56 = 172,489.12 : x
  2. Step 2: Convert to fraction form
    306,625.12/423,142.56 = 172,489.12/x
  3. Step 3: Cross multiply
    306,625.12x = 423,142.56 × 172,489.12
  4. Step 4: Simplify right side
    306,625.12x = 72,987,487,808.95
  5. Step 5: Solve for x
    x = 72,987,487,808.95/306,625.12
  6. Step 6: Final answer
    x = 238,034.93

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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.