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Finding the Fourth Proportional to 106.77, 147.28 and 65.31

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Solution

The fourth proportional to 106.77, 147.28 and 65.31 is: 90.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.77 : 147.28 = 65.31 : x
  2. Step 2: Convert to fraction form
    106.77/147.28 = 65.31/x
  3. Step 3: Cross multiply
    106.77x = 147.28 × 65.31
  4. Step 4: Simplify right side
    106.77x = 9,618.86
  5. Step 5: Solve for x
    x = 9,618.86/106.77
  6. Step 6: Final answer
    x = 90.09

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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.