Home / 81,121.72-111,974.70-47,587

Finding the Fourth Proportional to 81,121.72, 111,974.70 and 47,587

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Solution

The fourth proportional to 81,121.72, 111,974.70 and 47,587 is: 65,685.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,121.72 : 111,974.70 = 47,587 : x
  2. Step 2: Convert to fraction form
    81,121.72/111,974.70 = 47,587/x
  3. Step 3: Cross multiply
    81,121.72x = 111,974.70 × 47,587
  4. Step 4: Simplify right side
    81,121.72x = 5,328,540,048.90
  5. Step 5: Solve for x
    x = 5,328,540,048.90/81,121.72
  6. Step 6: Final answer
    x = 65,685.74

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1.5x scale

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.