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Finding the Fourth Proportional to 287.70, 431.59 and 92.64

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Solution

The fourth proportional to 287.70, 431.59 and 92.64 is: 138.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.70 : 431.59 = 92.64 : x
  2. Step 2: Convert to fraction form
    287.70/431.59 = 92.64/x
  3. Step 3: Cross multiply
    287.70x = 431.59 × 92.64
  4. Step 4: Simplify right side
    287.70x = 39,980.11
  5. Step 5: Solve for x
    x = 39,980.11/287.70
  6. Step 6: Final answer
    x = 138.96

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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.