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Finding the Fourth Proportional to 276,438.78, 381,497.79 and 155,587.90

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Solution

The fourth proportional to 276,438.78, 381,497.79 and 155,587.90 is: 214,718.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    276,438.78 : 381,497.79 = 155,587.90 : x
  2. Step 2: Convert to fraction form
    276,438.78/381,497.79 = 155,587.90/x
  3. Step 3: Cross multiply
    276,438.78x = 381,497.79 × 155,587.90
  4. Step 4: Simplify right side
    276,438.78x = 59,356,440,000.74
  5. Step 5: Solve for x
    x = 59,356,440,000.74/276,438.78
  6. Step 6: Final answer
    x = 214,718.21

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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.