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Finding the Fourth Proportional to 106.45, 159.71 and 72.35

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Solution

The fourth proportional to 106.45, 159.71 and 72.35 is: 108.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.45 : 159.71 = 72.35 : x
  2. Step 2: Convert to fraction form
    106.45/159.71 = 72.35/x
  3. Step 3: Cross multiply
    106.45x = 159.71 × 72.35
  4. Step 4: Simplify right side
    106.45x = 11,555.02
  5. Step 5: Solve for x
    x = 11,555.02/106.45
  6. Step 6: Final answer
    x = 108.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.