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Finding the Fourth Proportional to 2,145.52, 3,218.28 and 991.12

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Solution

The fourth proportional to 2,145.52, 3,218.28 and 991.12 is: 1,486.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.52 : 3,218.28 = 991.12 : x
  2. Step 2: Convert to fraction form
    2,145.52/3,218.28 = 991.12/x
  3. Step 3: Cross multiply
    2,145.52x = 3,218.28 × 991.12
  4. Step 4: Simplify right side
    2,145.52x = 3,189,701.67
  5. Step 5: Solve for x
    x = 3,189,701.67/2,145.52
  6. Step 6: Final answer
    x = 1,486.68

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Double 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.