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Finding the Fourth Proportional to 106.86, 147.49 and 63.19

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Solution

The fourth proportional to 106.86, 147.49 and 63.19 is: 87.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.86 : 147.49 = 63.19 : x
  2. Step 2: Convert to fraction form
    106.86/147.49 = 63.19/x
  3. Step 3: Cross multiply
    106.86x = 147.49 × 63.19
  4. Step 4: Simplify right side
    106.86x = 9,319.37
  5. Step 5: Solve for x
    x = 9,319.37/106.86
  6. Step 6: Final answer
    x = 87.21

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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.