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Finding the Fourth Proportional to 110.30, 165.04 and 87.21

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Solution

The fourth proportional to 110.30, 165.04 and 87.21 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.30 : 165.04 = 87.21 : x
  2. Step 2: Convert to fraction form
    110.30/165.04 = 87.21/x
  3. Step 3: Cross multiply
    110.30x = 165.04 × 87.21
  4. Step 4: Simplify right side
    110.30x = 14,392.92
  5. Step 5: Solve for x
    x = 14,392.92/110.30
  6. Step 6: Final answer
    x = 130.49

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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.