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Finding the Fourth Proportional to 3,091.68, 4,267.68 and 1,913.28

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Solution

The fourth proportional to 3,091.68, 4,267.68 and 1,913.28 is: 2,641.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,091.68 : 4,267.68 = 1,913.28 : x
  2. Step 2: Convert to fraction form
    3,091.68/4,267.68 = 1,913.28/x
  3. Step 3: Cross multiply
    3,091.68x = 4,267.68 × 1,913.28
  4. Step 4: Simplify right side
    3,091.68x = 8,165,266.79
  5. Step 5: Solve for x
    x = 8,165,266.79/3,091.68
  6. Step 6: Final answer
    x = 2,641.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.