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Finding the Fourth Proportional to 83.36, 114.78 and 72.38

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Solution

The fourth proportional to 83.36, 114.78 and 72.38 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.36 : 114.78 = 72.38 : x
  2. Step 2: Convert to fraction form
    83.36/114.78 = 72.38/x
  3. Step 3: Cross multiply
    83.36x = 114.78 × 72.38
  4. Step 4: Simplify right side
    83.36x = 8,307.78
  5. Step 5: Solve for x
    x = 8,307.78/83.36
  6. Step 6: Final answer
    x = 99.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.