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Finding the Fourth Proportional to 7,920, 11,878.20 and 2,990.16

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Solution

The fourth proportional to 7,920, 11,878.20 and 2,990.16 is: 4,484.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 11,878.20 = 2,990.16 : x
  2. Step 2: Convert to fraction form
    7,920/11,878.20 = 2,990.16/x
  3. Step 3: Cross multiply
    7,920x = 11,878.20 × 2,990.16
  4. Step 4: Simplify right side
    7,920x = 35,517,718.51
  5. Step 5: Solve for x
    x = 35,517,718.51/7,920
  6. Step 6: Final answer
    x = 4,484.56

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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.