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Finding the Fourth Proportional to 18,721.76, 28,082.10 and 4,870.76

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Solution

The fourth proportional to 18,721.76, 28,082.10 and 4,870.76 is: 7,305.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.76 : 28,082.10 = 4,870.76 : x
  2. Step 2: Convert to fraction form
    18,721.76/28,082.10 = 4,870.76/x
  3. Step 3: Cross multiply
    18,721.76x = 28,082.10 × 4,870.76
  4. Step 4: Simplify right side
    18,721.76x = 136,781,028.99
  5. Step 5: Solve for x
    x = 136,781,028.99/18,721.76
  6. Step 6: Final answer
    x = 7,305.99

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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.