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Finding the Fourth Proportional to 1,222.40, 1,833.78 and 400.40

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Solution

The fourth proportional to 1,222.40, 1,833.78 and 400.40 is: 600.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.40 : 1,833.78 = 400.40 : x
  2. Step 2: Convert to fraction form
    1,222.40/1,833.78 = 400.40/x
  3. Step 3: Cross multiply
    1,222.40x = 1,833.78 × 400.40
  4. Step 4: Simplify right side
    1,222.40x = 734,236.34
  5. Step 5: Solve for x
    x = 734,236.34/1,222.40
  6. Step 6: Final answer
    x = 600.65

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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.