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Finding the Fourth Proportional to 1,872.72, 2,809.43 and 718.38

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Solution

The fourth proportional to 1,872.72, 2,809.43 and 718.38 is: 1,077.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.72 : 2,809.43 = 718.38 : x
  2. Step 2: Convert to fraction form
    1,872.72/2,809.43 = 718.38/x
  3. Step 3: Cross multiply
    1,872.72x = 2,809.43 × 718.38
  4. Step 4: Simplify right side
    1,872.72x = 2,018,226.97
  5. Step 5: Solve for x
    x = 2,018,226.97/1,872.72
  6. Step 6: Final answer
    x = 1,077.70

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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.