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Finding the Fourth Proportional to 287.82, 431.73 and 71.40

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Solution

The fourth proportional to 287.82, 431.73 and 71.40 is: 107.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.82 : 431.73 = 71.40 : x
  2. Step 2: Convert to fraction form
    287.82/431.73 = 71.40/x
  3. Step 3: Cross multiply
    287.82x = 431.73 × 71.40
  4. Step 4: Simplify right side
    287.82x = 30,824.71
  5. Step 5: Solve for x
    x = 30,824.71/287.82
  6. Step 6: Final answer
    x = 107.10

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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.