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Finding the Fourth Proportional to 117.76, 176.64 and 72.10

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Solution

The fourth proportional to 117.76, 176.64 and 72.10 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.76 : 176.64 = 72.10 : x
  2. Step 2: Convert to fraction form
    117.76/176.64 = 72.10/x
  3. Step 3: Cross multiply
    117.76x = 176.64 × 72.10
  4. Step 4: Simplify right side
    117.76x = 12,735.74
  5. Step 5: Solve for x
    x = 12,735.74/117.76
  6. Step 6: Final answer
    x = 108.15

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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.