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Finding the Fourth Proportional to 117.35, 162.09 and 87.98

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Solution

The fourth proportional to 117.35, 162.09 and 87.98 is: 121.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.35 : 162.09 = 87.98 : x
  2. Step 2: Convert to fraction form
    117.35/162.09 = 87.98/x
  3. Step 3: Cross multiply
    117.35x = 162.09 × 87.98
  4. Step 4: Simplify right side
    117.35x = 14,260.01
  5. Step 5: Solve for x
    x = 14,260.01/117.35
  6. Step 6: Final answer
    x = 121.52

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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.