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Finding the Fourth Proportional to 276.55, 381.64 and 152.21

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Solution

The fourth proportional to 276.55, 381.64 and 152.21 is: 210.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.55 : 381.64 = 152.21 : x
  2. Step 2: Convert to fraction form
    276.55/381.64 = 152.21/x
  3. Step 3: Cross multiply
    276.55x = 381.64 × 152.21
  4. Step 4: Simplify right side
    276.55x = 58,089.42
  5. Step 5: Solve for x
    x = 58,089.42/276.55
  6. Step 6: Final answer
    x = 210.05

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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.