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Finding the Fourth Proportional to 426.18, 638.46 and 288.84

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Solution

The fourth proportional to 426.18, 638.46 and 288.84 is: 432.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.18 : 638.46 = 288.84 : x
  2. Step 2: Convert to fraction form
    426.18/638.46 = 288.84/x
  3. Step 3: Cross multiply
    426.18x = 638.46 × 288.84
  4. Step 4: Simplify right side
    426.18x = 184,412.79
  5. Step 5: Solve for x
    x = 184,412.79/426.18
  6. Step 6: Final answer
    x = 432.71

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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.