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Finding the Fourth Proportional to 315,990.88, 436,049.76 and 172,722.40

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Solution

The fourth proportional to 315,990.88, 436,049.76 and 172,722.40 is: 238,347.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,990.88 : 436,049.76 = 172,722.40 : x
  2. Step 2: Convert to fraction form
    315,990.88/436,049.76 = 172,722.40/x
  3. Step 3: Cross multiply
    315,990.88x = 436,049.76 × 172,722.40
  4. Step 4: Simplify right side
    315,990.88x = 75,315,561,066.62
  5. Step 5: Solve for x
    x = 75,315,561,066.62/315,990.88
  6. Step 6: Final answer
    x = 238,347.26

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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.