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Finding the Fourth Proportional to 278.85, 384.80 and 154.51

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Solution

The fourth proportional to 278.85, 384.80 and 154.51 is: 213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.85 : 384.80 = 154.51 : x
  2. Step 2: Convert to fraction form
    278.85/384.80 = 154.51/x
  3. Step 3: Cross multiply
    278.85x = 384.80 × 154.51
  4. Step 4: Simplify right side
    278.85x = 59,454.66
  5. Step 5: Solve for x
    x = 59,454.66/278.85
  6. Step 6: Final answer
    x = 213.22

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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.