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Finding the Fourth Proportional to 278.99, 417.85 and 148.76

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Solution

The fourth proportional to 278.99, 417.85 and 148.76 is: 222.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.99 : 417.85 = 148.76 : x
  2. Step 2: Convert to fraction form
    278.99/417.85 = 148.76/x
  3. Step 3: Cross multiply
    278.99x = 417.85 × 148.76
  4. Step 4: Simplify right side
    278.99x = 62,156.90
  5. Step 5: Solve for x
    x = 62,156.90/278.99
  6. Step 6: Final answer
    x = 222.80

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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.