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Finding the Fourth Proportional to 106.56, 147.05 and 65.11

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Solution

The fourth proportional to 106.56, 147.05 and 65.11 is: 89.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.56 : 147.05 = 65.11 : x
  2. Step 2: Convert to fraction form
    106.56/147.05 = 65.11/x
  3. Step 3: Cross multiply
    106.56x = 147.05 × 65.11
  4. Step 4: Simplify right side
    106.56x = 9,574.22
  5. Step 5: Solve for x
    x = 9,574.22/106.56
  6. Step 6: Final answer
    x = 89.85

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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.