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Finding the Fourth Proportional to 1,082.39, 1,631.68 and 990.14

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Solution

The fourth proportional to 1,082.39, 1,631.68 and 990.14 is: 1,492.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,082.39 : 1,631.68 = 990.14 : x
  2. Step 2: Convert to fraction form
    1,082.39/1,631.68 = 990.14/x
  3. Step 3: Cross multiply
    1,082.39x = 1,631.68 × 990.14
  4. Step 4: Simplify right side
    1,082.39x = 1,615,581.00
  5. Step 5: Solve for x
    x = 1,615,581.00/1,082.39
  6. Step 6: Final answer
    x = 1,492.61

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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.