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Finding the Fourth Proportional to 18,721.20, 28,081.80 and 4,870.20

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Solution

The fourth proportional to 18,721.20, 28,081.80 and 4,870.20 is: 7,305.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.20 : 28,081.80 = 4,870.20 : x
  2. Step 2: Convert to fraction form
    18,721.20/28,081.80 = 4,870.20/x
  3. Step 3: Cross multiply
    18,721.20x = 28,081.80 × 4,870.20
  4. Step 4: Simplify right side
    18,721.20x = 136,763,982.36
  5. Step 5: Solve for x
    x = 136,763,982.36/18,721.20
  6. Step 6: Final answer
    x = 7,305.30

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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.