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Finding the Fourth Proportional to 117.87, 162.48 and 78.47

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Solution

The fourth proportional to 117.87, 162.48 and 78.47 is: 108.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.87 : 162.48 = 78.47 : x
  2. Step 2: Convert to fraction form
    117.87/162.48 = 78.47/x
  3. Step 3: Cross multiply
    117.87x = 162.48 × 78.47
  4. Step 4: Simplify right side
    117.87x = 12,748.99
  5. Step 5: Solve for x
    x = 12,748.99/117.87
  6. Step 6: Final answer
    x = 108.16

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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.