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Finding the Fourth Proportional to 117.79, 176.70 and 49.31

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Solution

The fourth proportional to 117.79, 176.70 and 49.31 is: 73.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.79 : 176.70 = 49.31 : x
  2. Step 2: Convert to fraction form
    117.79/176.70 = 49.31/x
  3. Step 3: Cross multiply
    117.79x = 176.70 × 49.31
  4. Step 4: Simplify right side
    117.79x = 8,712.76
  5. Step 5: Solve for x
    x = 8,712.76/117.79
  6. Step 6: Final answer
    x = 73.97

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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.