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Finding the Fourth Proportional to 428.62, 590.95 and 288.52

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Solution

The fourth proportional to 428.62, 590.95 and 288.52 is: 397.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.62 : 590.95 = 288.52 : x
  2. Step 2: Convert to fraction form
    428.62/590.95 = 288.52/x
  3. Step 3: Cross multiply
    428.62x = 590.95 × 288.52
  4. Step 4: Simplify right side
    428.62x = 170,497.94
  5. Step 5: Solve for x
    x = 170,497.94/428.62
  6. Step 6: Final answer
    x = 397.78

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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.