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Finding the Fourth Proportional to 6,661.46, 9,990.30 and 1,981.28

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Solution

The fourth proportional to 6,661.46, 9,990.30 and 1,981.28 is: 2,971.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,661.46 : 9,990.30 = 1,981.28 : x
  2. Step 2: Convert to fraction form
    6,661.46/9,990.30 = 1,981.28/x
  3. Step 3: Cross multiply
    6,661.46x = 9,990.30 × 1,981.28
  4. Step 4: Simplify right side
    6,661.46x = 19,793,581.58
  5. Step 5: Solve for x
    x = 19,793,581.58/6,661.46
  6. Step 6: Final answer
    x = 2,971.36

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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.