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Finding the Fourth Proportional to 112.47, 155.16 and 65.82

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Solution

The fourth proportional to 112.47, 155.16 and 65.82 is: 90.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.47 : 155.16 = 65.82 : x
  2. Step 2: Convert to fraction form
    112.47/155.16 = 65.82/x
  3. Step 3: Cross multiply
    112.47x = 155.16 × 65.82
  4. Step 4: Simplify right side
    112.47x = 10,212.63
  5. Step 5: Solve for x
    x = 10,212.63/112.47
  6. Step 6: Final answer
    x = 90.80

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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.