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Finding the Fourth Proportional to 152.20, 228.28 and 71

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Solution

The fourth proportional to 152.20, 228.28 and 71 is: 106.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.20 : 228.28 = 71 : x
  2. Step 2: Convert to fraction form
    152.20/228.28 = 71/x
  3. Step 3: Cross multiply
    152.20x = 228.28 × 71
  4. Step 4: Simplify right side
    152.20x = 16,207.88
  5. Step 5: Solve for x
    x = 16,207.88/152.20
  6. Step 6: Final answer
    x = 106.49

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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.