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Finding the Fourth Proportional to 1,330.92, 1,993.88 and 781.46

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Solution

The fourth proportional to 1,330.92, 1,993.88 and 781.46 is: 1,170.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.92 : 1,993.88 = 781.46 : x
  2. Step 2: Convert to fraction form
    1,330.92/1,993.88 = 781.46/x
  3. Step 3: Cross multiply
    1,330.92x = 1,993.88 × 781.46
  4. Step 4: Simplify right side
    1,330.92x = 1,558,137.46
  5. Step 5: Solve for x
    x = 1,558,137.46/1,330.92
  6. Step 6: Final answer
    x = 1,170.72

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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.