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Finding the Fourth Proportional to 2,591.80, 3,887.70 and 2,130.10

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Solution

The fourth proportional to 2,591.80, 3,887.70 and 2,130.10 is: 3,195.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.80 : 3,887.70 = 2,130.10 : x
  2. Step 2: Convert to fraction form
    2,591.80/3,887.70 = 2,130.10/x
  3. Step 3: Cross multiply
    2,591.80x = 3,887.70 × 2,130.10
  4. Step 4: Simplify right side
    2,591.80x = 8,281,189.77
  5. Step 5: Solve for x
    x = 8,281,189.77/2,591.80
  6. Step 6: Final answer
    x = 3,195.15

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Half scale
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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.