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Finding the Fourth Proportional to 106.50, 147.11 and 90.30

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Solution

The fourth proportional to 106.50, 147.11 and 90.30 is: 124.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.50 : 147.11 = 90.30 : x
  2. Step 2: Convert to fraction form
    106.50/147.11 = 90.30/x
  3. Step 3: Cross multiply
    106.50x = 147.11 × 90.30
  4. Step 4: Simplify right side
    106.50x = 13,283.54
  5. Step 5: Solve for x
    x = 13,283.54/106.50
  6. Step 6: Final answer
    x = 124.73

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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.