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Finding the Fourth Proportional to 278.81, 384.78 and 162.40

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Solution

The fourth proportional to 278.81, 384.78 and 162.40 is: 224.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.81 : 384.78 = 162.40 : x
  2. Step 2: Convert to fraction form
    278.81/384.78 = 162.40/x
  3. Step 3: Cross multiply
    278.81x = 384.78 × 162.40
  4. Step 4: Simplify right side
    278.81x = 62,487.92
  5. Step 5: Solve for x
    x = 62,487.92/278.81
  6. Step 6: Final answer
    x = 224.12

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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.