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Finding the Fourth Proportional to 288.04, 431.20 and 281.87

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Solution

The fourth proportional to 288.04, 431.20 and 281.87 is: 421.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.04 : 431.20 = 281.87 : x
  2. Step 2: Convert to fraction form
    288.04/431.20 = 281.87/x
  3. Step 3: Cross multiply
    288.04x = 431.20 × 281.87
  4. Step 4: Simplify right side
    288.04x = 121,542.34
  5. Step 5: Solve for x
    x = 121,542.34/288.04
  6. Step 6: Final answer
    x = 421.96

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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.