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Finding the Fourth Proportional to 117.79, 176.61 and 74.51

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Solution

The fourth proportional to 117.79, 176.61 and 74.51 is: 111.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.79 : 176.61 = 74.51 : x
  2. Step 2: Convert to fraction form
    117.79/176.61 = 74.51/x
  3. Step 3: Cross multiply
    117.79x = 176.61 × 74.51
  4. Step 4: Simplify right side
    117.79x = 13,159.21
  5. Step 5: Solve for x
    x = 13,159.21/117.79
  6. Step 6: Final answer
    x = 111.72

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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.