Home / 90,828.20-136,112.70-66,949.40

Finding the Fourth Proportional to 90,828.20, 136,112.70 and 66,949.40

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Solution

The fourth proportional to 90,828.20, 136,112.70 and 66,949.40 is: 100,328.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,828.20 : 136,112.70 = 66,949.40 : x
  2. Step 2: Convert to fraction form
    90,828.20/136,112.70 = 66,949.40/x
  3. Step 3: Cross multiply
    90,828.20x = 136,112.70 × 66,949.40
  4. Step 4: Simplify right side
    90,828.20x = 9,112,663,597.38
  5. Step 5: Solve for x
    x = 9,112,663,597.38/90,828.20
  6. Step 6: Final answer
    x = 100,328.57

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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.