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Finding the Fourth Proportional to 2,643.84, 3,988.85 and 2,636.55

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Solution

The fourth proportional to 2,643.84, 3,988.85 and 2,636.55 is: 3,977.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.84 : 3,988.85 = 2,636.55 : x
  2. Step 2: Convert to fraction form
    2,643.84/3,988.85 = 2,636.55/x
  3. Step 3: Cross multiply
    2,643.84x = 3,988.85 × 2,636.55
  4. Step 4: Simplify right side
    2,643.84x = 10,516,789.28
  5. Step 5: Solve for x
    x = 10,516,789.28/2,643.84
  6. Step 6: Final answer
    x = 3,977.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.