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Finding the Fourth Proportional to 287.81, 431.60 and 178.11

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Solution

The fourth proportional to 287.81, 431.60 and 178.11 is: 267.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.81 : 431.60 = 178.11 : x
  2. Step 2: Convert to fraction form
    287.81/431.60 = 178.11/x
  3. Step 3: Cross multiply
    287.81x = 431.60 × 178.11
  4. Step 4: Simplify right side
    287.81x = 76,871.39
  5. Step 5: Solve for x
    x = 76,871.39/287.81
  6. Step 6: Final answer
    x = 267.10

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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.