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Finding the Fourth Proportional to 113.07, 155.78 and 74.19

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Solution

The fourth proportional to 113.07, 155.78 and 74.19 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.07 : 155.78 = 74.19 : x
  2. Step 2: Convert to fraction form
    113.07/155.78 = 74.19/x
  3. Step 3: Cross multiply
    113.07x = 155.78 × 74.19
  4. Step 4: Simplify right side
    113.07x = 11,557.32
  5. Step 5: Solve for x
    x = 11,557.32/113.07
  6. Step 6: Final answer
    x = 102.21

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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.