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Finding the Fourth Proportional to 35.79, 53.69 and 20.57

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Solution

The fourth proportional to 35.79, 53.69 and 20.57 is: 30.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.79 : 53.69 = 20.57 : x
  2. Step 2: Convert to fraction form
    35.79/53.69 = 20.57/x
  3. Step 3: Cross multiply
    35.79x = 53.69 × 20.57
  4. Step 4: Simplify right side
    35.79x = 1,104.71
  5. Step 5: Solve for x
    x = 1,104.71/35.79
  6. Step 6: Final answer
    x = 30.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.