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Finding the Fourth Proportional to 287.46, 431.39 and 259.92

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Solution

The fourth proportional to 287.46, 431.39 and 259.92 is: 390.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.46 : 431.39 = 259.92 : x
  2. Step 2: Convert to fraction form
    287.46/431.39 = 259.92/x
  3. Step 3: Cross multiply
    287.46x = 431.39 × 259.92
  4. Step 4: Simplify right side
    287.46x = 112,127.54
  5. Step 5: Solve for x
    x = 112,127.54/287.46
  6. Step 6: Final answer
    x = 390.06

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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.