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Finding the Fourth Proportional to 18,721.80, 28,082.70 and 4,870.80

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Solution

The fourth proportional to 18,721.80, 28,082.70 and 4,870.80 is: 7,306.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.80 : 28,082.70 = 4,870.80 : x
  2. Step 2: Convert to fraction form
    18,721.80/28,082.70 = 4,870.80/x
  3. Step 3: Cross multiply
    18,721.80x = 28,082.70 × 4,870.80
  4. Step 4: Simplify right side
    18,721.80x = 136,785,215.16
  5. Step 5: Solve for x
    x = 136,785,215.16/18,721.80
  6. Step 6: Final answer
    x = 7,306.20

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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.