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Finding the Fourth Proportional to 112.07, 154.45 and 106.90

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Solution

The fourth proportional to 112.07, 154.45 and 106.90 is: 147.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.07 : 154.45 = 106.90 : x
  2. Step 2: Convert to fraction form
    112.07/154.45 = 106.90/x
  3. Step 3: Cross multiply
    112.07x = 154.45 × 106.90
  4. Step 4: Simplify right side
    112.07x = 16,510.71
  5. Step 5: Solve for x
    x = 16,510.71/112.07
  6. Step 6: Final answer
    x = 147.32

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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.