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Finding the Fourth Proportional to 152.20, 228.12 and 91.36

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Solution

The fourth proportional to 152.20, 228.12 and 91.36 is: 136.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.20 : 228.12 = 91.36 : x
  2. Step 2: Convert to fraction form
    152.20/228.12 = 91.36/x
  3. Step 3: Cross multiply
    152.20x = 228.12 × 91.36
  4. Step 4: Simplify right side
    152.20x = 20,841.04
  5. Step 5: Solve for x
    x = 20,841.04/152.20
  6. Step 6: Final answer
    x = 136.93

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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.