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Finding the Fourth Proportional to 112.65, 155.63 and 86.53

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Solution

The fourth proportional to 112.65, 155.63 and 86.53 is: 119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.65 : 155.63 = 86.53 : x
  2. Step 2: Convert to fraction form
    112.65/155.63 = 86.53/x
  3. Step 3: Cross multiply
    112.65x = 155.63 × 86.53
  4. Step 4: Simplify right side
    112.65x = 13,465.89
  5. Step 5: Solve for x
    x = 13,465.89/112.65
  6. Step 6: Final answer
    x = 119.54

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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.