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Finding the Fourth Proportional to 152.69, 228.42 and 138.92

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Solution

The fourth proportional to 152.69, 228.42 and 138.92 is: 207.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.69 : 228.42 = 138.92 : x
  2. Step 2: Convert to fraction form
    152.69/228.42 = 138.92/x
  3. Step 3: Cross multiply
    152.69x = 228.42 × 138.92
  4. Step 4: Simplify right side
    152.69x = 31,730.96
  5. Step 5: Solve for x
    x = 31,730.96/152.69
  6. Step 6: Final answer
    x = 207.82

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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.