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Finding the Fourth Proportional to 112.94, 155.71 and 93.20

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Solution

The fourth proportional to 112.94, 155.71 and 93.20 is: 128.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.94 : 155.71 = 93.20 : x
  2. Step 2: Convert to fraction form
    112.94/155.71 = 93.20/x
  3. Step 3: Cross multiply
    112.94x = 155.71 × 93.20
  4. Step 4: Simplify right side
    112.94x = 14,512.17
  5. Step 5: Solve for x
    x = 14,512.17/112.94
  6. Step 6: Final answer
    x = 128.49

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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.