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Finding the Fourth Proportional to 152.10, 227.90 and 91.20

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Solution

The fourth proportional to 152.10, 227.90 and 91.20 is: 136.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.10 : 227.90 = 91.20 : x
  2. Step 2: Convert to fraction form
    152.10/227.90 = 91.20/x
  3. Step 3: Cross multiply
    152.10x = 227.90 × 91.20
  4. Step 4: Simplify right side
    152.10x = 20,784.71
  5. Step 5: Solve for x
    x = 20,784.71/152.10
  6. Step 6: Final answer
    x = 136.65

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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.