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Finding the Fourth Proportional to 106.91, 147.56 and 65.48

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Solution

The fourth proportional to 106.91, 147.56 and 65.48 is: 90.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.91 : 147.56 = 65.48 : x
  2. Step 2: Convert to fraction form
    106.91/147.56 = 65.48/x
  3. Step 3: Cross multiply
    106.91x = 147.56 × 65.48
  4. Step 4: Simplify right side
    106.91x = 9,661.16
  5. Step 5: Solve for x
    x = 9,661.16/106.91
  6. Step 6: Final answer
    x = 90.37

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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.