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Finding the Fourth Proportional to 278.58, 384.44 and 154.24

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Solution

The fourth proportional to 278.58, 384.44 and 154.24 is: 212.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.58 : 384.44 = 154.24 : x
  2. Step 2: Convert to fraction form
    278.58/384.44 = 154.24/x
  3. Step 3: Cross multiply
    278.58x = 384.44 × 154.24
  4. Step 4: Simplify right side
    278.58x = 59,294.58
  5. Step 5: Solve for x
    x = 59,294.58/278.58
  6. Step 6: Final answer
    x = 212.85

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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.