Home / 1,216.40-1,679.56-936.20

Finding the Fourth Proportional to 1,216.40, 1,679.56 and 936.20

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Solution

The fourth proportional to 1,216.40, 1,679.56 and 936.20 is: 1,292.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.40 : 1,679.56 = 936.20 : x
  2. Step 2: Convert to fraction form
    1,216.40/1,679.56 = 936.20/x
  3. Step 3: Cross multiply
    1,216.40x = 1,679.56 × 936.20
  4. Step 4: Simplify right side
    1,216.40x = 1,572,404.07
  5. Step 5: Solve for x
    x = 1,572,404.07/1,216.40
  6. Step 6: Final answer
    x = 1,292.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.