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Finding the Fourth Proportional to 152.21, 228.12 and 87.11

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Solution

The fourth proportional to 152.21, 228.12 and 87.11 is: 130.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.21 : 228.12 = 87.11 : x
  2. Step 2: Convert to fraction form
    152.21/228.12 = 87.11/x
  3. Step 3: Cross multiply
    152.21x = 228.12 × 87.11
  4. Step 4: Simplify right side
    152.21x = 19,870.39
  5. Step 5: Solve for x
    x = 19,870.39/152.21
  6. Step 6: Final answer
    x = 130.55

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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.