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Finding the Fourth Proportional to 2,591.30, 3,886.95 and 643.49

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Solution

The fourth proportional to 2,591.30, 3,886.95 and 643.49 is: 965.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.30 : 3,886.95 = 643.49 : x
  2. Step 2: Convert to fraction form
    2,591.30/3,886.95 = 643.49/x
  3. Step 3: Cross multiply
    2,591.30x = 3,886.95 × 643.49
  4. Step 4: Simplify right side
    2,591.30x = 2,501,213.46
  5. Step 5: Solve for x
    x = 2,501,213.46/2,591.30
  6. Step 6: Final answer
    x = 965.24

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Similar ratio
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1.5x scale

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.