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Finding the Fourth Proportional to 6,660.54, 9,989.10 and 1,979.45

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Solution

The fourth proportional to 6,660.54, 9,989.10 and 1,979.45 is: 2,968.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660.54 : 9,989.10 = 1,979.45 : x
  2. Step 2: Convert to fraction form
    6,660.54/9,989.10 = 1,979.45/x
  3. Step 3: Cross multiply
    6,660.54x = 9,989.10 × 1,979.45
  4. Step 4: Simplify right side
    6,660.54x = 19,772,874.05
  5. Step 5: Solve for x
    x = 19,772,874.05/6,660.54
  6. Step 6: Final answer
    x = 2,968.66

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1.5x scale

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.