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Finding the Fourth Proportional to 117.96, 176.58 and 90.72

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Solution

The fourth proportional to 117.96, 176.58 and 90.72 is: 135.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.96 : 176.58 = 90.72 : x
  2. Step 2: Convert to fraction form
    117.96/176.58 = 90.72/x
  3. Step 3: Cross multiply
    117.96x = 176.58 × 90.72
  4. Step 4: Simplify right side
    117.96x = 16,019.34
  5. Step 5: Solve for x
    x = 16,019.34/117.96
  6. Step 6: Final answer
    x = 135.80

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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.