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Finding the Fourth Proportional to 288.62, 433.74 and 278.90

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Solution

The fourth proportional to 288.62, 433.74 and 278.90 is: 419.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.62 : 433.74 = 278.90 : x
  2. Step 2: Convert to fraction form
    288.62/433.74 = 278.90/x
  3. Step 3: Cross multiply
    288.62x = 433.74 × 278.90
  4. Step 4: Simplify right side
    288.62x = 120,967.92
  5. Step 5: Solve for x
    x = 120,967.92/288.62
  6. Step 6: Final answer
    x = 419.13

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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.