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Finding the Fourth Proportional to 288.74, 431.89 and 260.34

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Solution

The fourth proportional to 288.74, 431.89 and 260.34 is: 389.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.74 : 431.89 = 260.34 : x
  2. Step 2: Convert to fraction form
    288.74/431.89 = 260.34/x
  3. Step 3: Cross multiply
    288.74x = 431.89 × 260.34
  4. Step 4: Simplify right side
    288.74x = 112,438.24
  5. Step 5: Solve for x
    x = 112,438.24/288.74
  6. Step 6: Final answer
    x = 389.41

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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.