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Finding the Fourth Proportional to 276,249.40, 381,220.31 and 155,390.69

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Solution

The fourth proportional to 276,249.40, 381,220.31 and 155,390.69 is: 214,436.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    276,249.40 : 381,220.31 = 155,390.69 : x
  2. Step 2: Convert to fraction form
    276,249.40/381,220.31 = 155,390.69/x
  3. Step 3: Cross multiply
    276,249.40x = 381,220.31 × 155,390.69
  4. Step 4: Simplify right side
    276,249.40x = 59,238,087,012.91
  5. Step 5: Solve for x
    x = 59,238,087,012.91/276,249.40
  6. Step 6: Final answer
    x = 214,436.98

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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.