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Finding the Fourth Proportional to 18,911.20, 28,366.80 and 4,871.20

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Solution

The fourth proportional to 18,911.20, 28,366.80 and 4,871.20 is: 7,306.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.20 : 28,366.80 = 4,871.20 : x
  2. Step 2: Convert to fraction form
    18,911.20/28,366.80 = 4,871.20/x
  3. Step 3: Cross multiply
    18,911.20x = 28,366.80 × 4,871.20
  4. Step 4: Simplify right side
    18,911.20x = 138,180,356.16
  5. Step 5: Solve for x
    x = 138,180,356.16/18,911.20
  6. Step 6: Final answer
    x = 7,306.80

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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.