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Finding the Fourth Proportional to 88.79, 133.11 and 31

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Solution

The fourth proportional to 88.79, 133.11 and 31 is: 46.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.79 : 133.11 = 31 : x
  2. Step 2: Convert to fraction form
    88.79/133.11 = 31/x
  3. Step 3: Cross multiply
    88.79x = 133.11 × 31
  4. Step 4: Simplify right side
    88.79x = 4,126.41
  5. Step 5: Solve for x
    x = 4,126.41/88.79
  6. Step 6: Final answer
    x = 46.47

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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.