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Finding the Fourth Proportional to 117.69, 176.50 and 74.35

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Solution

The fourth proportional to 117.69, 176.50 and 74.35 is: 111.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.69 : 176.50 = 74.35 : x
  2. Step 2: Convert to fraction form
    117.69/176.50 = 74.35/x
  3. Step 3: Cross multiply
    117.69x = 176.50 × 74.35
  4. Step 4: Simplify right side
    117.69x = 13,123.01
  5. Step 5: Solve for x
    x = 13,123.01/117.69
  6. Step 6: Final answer
    x = 111.50

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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.