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Finding the Fourth Proportional to 90,885.91, 136,391.15 and 31,721.58

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Solution

The fourth proportional to 90,885.91, 136,391.15 and 31,721.58 is: 47,604.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,885.91 : 136,391.15 = 31,721.58 : x
  2. Step 2: Convert to fraction form
    90,885.91/136,391.15 = 31,721.58/x
  3. Step 3: Cross multiply
    90,885.91x = 136,391.15 × 31,721.58
  4. Step 4: Simplify right side
    90,885.91x = 4,326,542,094.06
  5. Step 5: Solve for x
    x = 4,326,542,094.06/90,885.91
  6. Step 6: Final answer
    x = 47,604.10

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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.