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Finding the Fourth Proportional to 117.90, 162.90 and 108.72

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Solution

The fourth proportional to 117.90, 162.90 and 108.72 is: 150.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.90 : 162.90 = 108.72 : x
  2. Step 2: Convert to fraction form
    117.90/162.90 = 108.72/x
  3. Step 3: Cross multiply
    117.90x = 162.90 × 108.72
  4. Step 4: Simplify right side
    117.90x = 17,710.49
  5. Step 5: Solve for x
    x = 17,710.49/117.90
  6. Step 6: Final answer
    x = 150.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.