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Finding the Fourth Proportional to 154.32, 213 and 142.80

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Solution

The fourth proportional to 154.32, 213 and 142.80 is: 197.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.32 : 213 = 142.80 : x
  2. Step 2: Convert to fraction form
    154.32/213 = 142.80/x
  3. Step 3: Cross multiply
    154.32x = 213 × 142.80
  4. Step 4: Simplify right side
    154.32x = 30,416.40
  5. Step 5: Solve for x
    x = 30,416.40/154.32
  6. Step 6: Final answer
    x = 197.10

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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.