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Finding the Fourth Proportional to 40.64, 55.98 and 28.34

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Solution

The fourth proportional to 40.64, 55.98 and 28.34 is: 39.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.64 : 55.98 = 28.34 : x
  2. Step 2: Convert to fraction form
    40.64/55.98 = 28.34/x
  3. Step 3: Cross multiply
    40.64x = 55.98 × 28.34
  4. Step 4: Simplify right side
    40.64x = 1,586.19
  5. Step 5: Solve for x
    x = 1,586.19/40.64
  6. Step 6: Final answer
    x = 39.04

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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.