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Finding the Fourth Proportional to 148.20, 222.30 and 87.40

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Solution

The fourth proportional to 148.20, 222.30 and 87.40 is: 131.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.20 : 222.30 = 87.40 : x
  2. Step 2: Convert to fraction form
    148.20/222.30 = 87.40/x
  3. Step 3: Cross multiply
    148.20x = 222.30 × 87.40
  4. Step 4: Simplify right side
    148.20x = 19,429.02
  5. Step 5: Solve for x
    x = 19,429.02/148.20
  6. Step 6: Final answer
    x = 131.10

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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.