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Finding the Fourth Proportional to 287.98, 431.99 and 102.87

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Solution

The fourth proportional to 287.98, 431.99 and 102.87 is: 154.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.98 : 431.99 = 102.87 : x
  2. Step 2: Convert to fraction form
    287.98/431.99 = 102.87/x
  3. Step 3: Cross multiply
    287.98x = 431.99 × 102.87
  4. Step 4: Simplify right side
    287.98x = 44,440.36
  5. Step 5: Solve for x
    x = 44,440.36/287.98
  6. Step 6: Final answer
    x = 154.32

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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.