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Finding the Fourth Proportional to 102.86, 154.29 and 72.38

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Solution

The fourth proportional to 102.86, 154.29 and 72.38 is: 108.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.86 : 154.29 = 72.38 : x
  2. Step 2: Convert to fraction form
    102.86/154.29 = 72.38/x
  3. Step 3: Cross multiply
    102.86x = 154.29 × 72.38
  4. Step 4: Simplify right side
    102.86x = 11,167.51
  5. Step 5: Solve for x
    x = 11,167.51/102.86
  6. Step 6: Final answer
    x = 108.57

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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.