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Finding the Fourth Proportional to 1,383.74, 2,073.78 and 767.12

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Solution

The fourth proportional to 1,383.74, 2,073.78 and 767.12 is: 1,149.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.74 : 2,073.78 = 767.12 : x
  2. Step 2: Convert to fraction form
    1,383.74/2,073.78 = 767.12/x
  3. Step 3: Cross multiply
    1,383.74x = 2,073.78 × 767.12
  4. Step 4: Simplify right side
    1,383.74x = 1,590,834.28
  5. Step 5: Solve for x
    x = 1,590,834.28/1,383.74
  6. Step 6: Final answer
    x = 1,149.67

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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.