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Finding the Fourth Proportional to 2,920, 4,032.88 and 1,986.88

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Solution

The fourth proportional to 2,920, 4,032.88 and 1,986.88 is: 2,744.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920 : 4,032.88 = 1,986.88 : x
  2. Step 2: Convert to fraction form
    2,920/4,032.88 = 1,986.88/x
  3. Step 3: Cross multiply
    2,920x = 4,032.88 × 1,986.88
  4. Step 4: Simplify right side
    2,920x = 8,012,848.61
  5. Step 5: Solve for x
    x = 8,012,848.61/2,920
  6. Step 6: Final answer
    x = 2,744.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.