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Finding the Fourth Proportional to 35.79, 53.90 and 30.69

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Solution

The fourth proportional to 35.79, 53.90 and 30.69 is: 46.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.79 : 53.90 = 30.69 : x
  2. Step 2: Convert to fraction form
    35.79/53.90 = 30.69/x
  3. Step 3: Cross multiply
    35.79x = 53.90 × 30.69
  4. Step 4: Simplify right side
    35.79x = 1,654.04
  5. Step 5: Solve for x
    x = 1,654.04/35.79
  6. Step 6: Final answer
    x = 46.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.