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Finding the Fourth Proportional to 815,443.80, 1,223,165.70 and 254,405.40

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Solution

The fourth proportional to 815,443.80, 1,223,165.70 and 254,405.40 is: 381,608.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,443.80 : 1,223,165.70 = 254,405.40 : x
  2. Step 2: Convert to fraction form
    815,443.80/1,223,165.70 = 254,405.40/x
  3. Step 3: Cross multiply
    815,443.80x = 1,223,165.70 × 254,405.40
  4. Step 4: Simplify right side
    815,443.80x = 311,179,959,174.78
  5. Step 5: Solve for x
    x = 311,179,959,174.78/815,443.80
  6. Step 6: Final answer
    x = 381,608.10

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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.