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Finding the Fourth Proportional to 18,721.17, 28,081.80 and 4,870.17

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Solution

The fourth proportional to 18,721.17, 28,081.80 and 4,870.17 is: 7,305.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.17 : 28,081.80 = 4,870.17 : x
  2. Step 2: Convert to fraction form
    18,721.17/28,081.80 = 4,870.17/x
  3. Step 3: Cross multiply
    18,721.17x = 28,081.80 × 4,870.17
  4. Step 4: Simplify right side
    18,721.17x = 136,763,139.91
  5. Step 5: Solve for x
    x = 136,763,139.91/18,721.17
  6. Step 6: Final answer
    x = 7,305.27

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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.