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Finding the Fourth Proportional to 278.28, 384.08 and 161.86

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Solution

The fourth proportional to 278.28, 384.08 and 161.86 is: 223.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.28 : 384.08 = 161.86 : x
  2. Step 2: Convert to fraction form
    278.28/384.08 = 161.86/x
  3. Step 3: Cross multiply
    278.28x = 384.08 × 161.86
  4. Step 4: Simplify right side
    278.28x = 62,167.19
  5. Step 5: Solve for x
    x = 62,167.19/278.28
  6. Step 6: Final answer
    x = 223.40

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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.