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Finding the Fourth Proportional to 90,208.59, 124,486.06 and 49,920

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Solution

The fourth proportional to 90,208.59, 124,486.06 and 49,920 is: 68,888.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,208.59 : 124,486.06 = 49,920 : x
  2. Step 2: Convert to fraction form
    90,208.59/124,486.06 = 49,920/x
  3. Step 3: Cross multiply
    90,208.59x = 124,486.06 × 49,920
  4. Step 4: Simplify right side
    90,208.59x = 6,214,344,115.20
  5. Step 5: Solve for x
    x = 6,214,344,115.20/90,208.59
  6. Step 6: Final answer
    x = 68,888.61

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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.