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Finding the Fourth Proportional to 8,920.53, 13,382.42 and 3,990.06

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Solution

The fourth proportional to 8,920.53, 13,382.42 and 3,990.06 is: 5,985.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.53 : 13,382.42 = 3,990.06 : x
  2. Step 2: Convert to fraction form
    8,920.53/13,382.42 = 3,990.06/x
  3. Step 3: Cross multiply
    8,920.53x = 13,382.42 × 3,990.06
  4. Step 4: Simplify right side
    8,920.53x = 53,396,638.79
  5. Step 5: Solve for x
    x = 53,396,638.79/8,920.53
  6. Step 6: Final answer
    x = 5,985.81

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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.