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Finding the Fourth Proportional to 1,238.70, 1,859.85 and 753.78

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Solution

The fourth proportional to 1,238.70, 1,859.85 and 753.78 is: 1,131.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.70 : 1,859.85 = 753.78 : x
  2. Step 2: Convert to fraction form
    1,238.70/1,859.85 = 753.78/x
  3. Step 3: Cross multiply
    1,238.70x = 1,859.85 × 753.78
  4. Step 4: Simplify right side
    1,238.70x = 1,401,917.73
  5. Step 5: Solve for x
    x = 1,401,917.73/1,238.70
  6. Step 6: Final answer
    x = 1,131.77

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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.