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Finding the Fourth Proportional to 278.42, 417.71 and 148.39

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Solution

The fourth proportional to 278.42, 417.71 and 148.39 is: 222.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.42 : 417.71 = 148.39 : x
  2. Step 2: Convert to fraction form
    278.42/417.71 = 148.39/x
  3. Step 3: Cross multiply
    278.42x = 417.71 × 148.39
  4. Step 4: Simplify right side
    278.42x = 61,983.99
  5. Step 5: Solve for x
    x = 61,983.99/278.42
  6. Step 6: Final answer
    x = 222.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.