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Finding the Fourth Proportional to 117.59, 162.33 and 78.31

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Solution

The fourth proportional to 117.59, 162.33 and 78.31 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.59 : 162.33 = 78.31 : x
  2. Step 2: Convert to fraction form
    117.59/162.33 = 78.31/x
  3. Step 3: Cross multiply
    117.59x = 162.33 × 78.31
  4. Step 4: Simplify right side
    117.59x = 12,712.06
  5. Step 5: Solve for x
    x = 12,712.06/117.59
  6. Step 6: Final answer
    x = 108.10

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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.