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Finding the Fourth Proportional to 109.04, 150.48 and 87.20

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Solution

The fourth proportional to 109.04, 150.48 and 87.20 is: 120.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.04 : 150.48 = 87.20 : x
  2. Step 2: Convert to fraction form
    109.04/150.48 = 87.20/x
  3. Step 3: Cross multiply
    109.04x = 150.48 × 87.20
  4. Step 4: Simplify right side
    109.04x = 13,121.86
  5. Step 5: Solve for x
    x = 13,121.86/109.04
  6. Step 6: Final answer
    x = 120.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.