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Finding the Fourth Proportional to 113.12, 155.55 and 93.21

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Solution

The fourth proportional to 113.12, 155.55 and 93.21 is: 128.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.12 : 155.55 = 93.21 : x
  2. Step 2: Convert to fraction form
    113.12/155.55 = 93.21/x
  3. Step 3: Cross multiply
    113.12x = 155.55 × 93.21
  4. Step 4: Simplify right side
    113.12x = 14,498.82
  5. Step 5: Solve for x
    x = 14,498.82/113.12
  6. Step 6: Final answer
    x = 128.17

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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.