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Finding the Fourth Proportional to 2,143.68, 3,215.52 and 990.72

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Solution

The fourth proportional to 2,143.68, 3,215.52 and 990.72 is: 1,486.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.68 : 3,215.52 = 990.72 : x
  2. Step 2: Convert to fraction form
    2,143.68/3,215.52 = 990.72/x
  3. Step 3: Cross multiply
    2,143.68x = 3,215.52 × 990.72
  4. Step 4: Simplify right side
    2,143.68x = 3,185,679.97
  5. Step 5: Solve for x
    x = 3,185,679.97/2,143.68
  6. Step 6: Final answer
    x = 1,486.08

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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.