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Finding the Fourth Proportional to 40.35, 55.70 and 28.69

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Solution

The fourth proportional to 40.35, 55.70 and 28.69 is: 39.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.35 : 55.70 = 28.69 : x
  2. Step 2: Convert to fraction form
    40.35/55.70 = 28.69/x
  3. Step 3: Cross multiply
    40.35x = 55.70 × 28.69
  4. Step 4: Simplify right side
    40.35x = 1,598.10
  5. Step 5: Solve for x
    x = 1,598.10/40.35
  6. Step 6: Final answer
    x = 39.61

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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.