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Finding the Fourth Proportional to 197,988, 297,028.72 and 66,660

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Solution

The fourth proportional to 197,988, 297,028.72 and 66,660 is: 100,005.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    197,988 : 297,028.72 = 66,660 : x
  2. Step 2: Convert to fraction form
    197,988/297,028.72 = 66,660/x
  3. Step 3: Cross multiply
    197,988x = 297,028.72 × 66,660
  4. Step 4: Simplify right side
    197,988x = 19,799,934,475.20
  5. Step 5: Solve for x
    x = 19,799,934,475.20/197,988
  6. Step 6: Final answer
    x = 100,005.73

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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.