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Finding the Fourth Proportional to 2,676.72, 4,013.64 and 921.12

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Solution

The fourth proportional to 2,676.72, 4,013.64 and 921.12 is: 1,381.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,676.72 : 4,013.64 = 921.12 : x
  2. Step 2: Convert to fraction form
    2,676.72/4,013.64 = 921.12/x
  3. Step 3: Cross multiply
    2,676.72x = 4,013.64 × 921.12
  4. Step 4: Simplify right side
    2,676.72x = 3,697,044.08
  5. Step 5: Solve for x
    x = 3,697,044.08/2,676.72
  6. Step 6: Final answer
    x = 1,381.18

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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.