Home / 1,330.35-1,991.57-985.20

Finding the Fourth Proportional to 1,330.35, 1,991.57 and 985.20

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Solution

The fourth proportional to 1,330.35, 1,991.57 and 985.20 is: 1,474.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.35 : 1,991.57 = 985.20 : x
  2. Step 2: Convert to fraction form
    1,330.35/1,991.57 = 985.20/x
  3. Step 3: Cross multiply
    1,330.35x = 1,991.57 × 985.20
  4. Step 4: Simplify right side
    1,330.35x = 1,962,089.84
  5. Step 5: Solve for x
    x = 1,962,089.84/1,330.35
  6. Step 6: Final answer
    x = 1,474.87

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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.