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Finding the Fourth Proportional to 74,680.40, 111,947.70 and 66,807.20

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Solution

The fourth proportional to 74,680.40, 111,947.70 and 66,807.20 is: 100,145.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,680.40 : 111,947.70 = 66,807.20 : x
  2. Step 2: Convert to fraction form
    74,680.40/111,947.70 = 66,807.20/x
  3. Step 3: Cross multiply
    74,680.40x = 111,947.70 × 66,807.20
  4. Step 4: Simplify right side
    74,680.40x = 7,478,912,383.44
  5. Step 5: Solve for x
    x = 7,478,912,383.44/74,680.40
  6. Step 6: Final answer
    x = 100,145.59

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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.