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Finding the Fourth Proportional to 278.40, 384.20 and 180.08

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Solution

The fourth proportional to 278.40, 384.20 and 180.08 is: 248.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.40 : 384.20 = 180.08 : x
  2. Step 2: Convert to fraction form
    278.40/384.20 = 180.08/x
  3. Step 3: Cross multiply
    278.40x = 384.20 × 180.08
  4. Step 4: Simplify right side
    278.40x = 69,186.74
  5. Step 5: Solve for x
    x = 69,186.74/278.40
  6. Step 6: Final answer
    x = 248.52

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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.