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Finding the Fourth Proportional to 18,721.60, 28,082.40 and 4,870.60

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Solution

The fourth proportional to 18,721.60, 28,082.40 and 4,870.60 is: 7,305.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.60 : 28,082.40 = 4,870.60 : x
  2. Step 2: Convert to fraction form
    18,721.60/28,082.40 = 4,870.60/x
  3. Step 3: Cross multiply
    18,721.60x = 28,082.40 × 4,870.60
  4. Step 4: Simplify right side
    18,721.60x = 136,778,137.44
  5. Step 5: Solve for x
    x = 136,778,137.44/18,721.60
  6. Step 6: Final answer
    x = 7,305.90

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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.