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Finding the Fourth Proportional to 35.90, 53.76 and 19.79

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Solution

The fourth proportional to 35.90, 53.76 and 19.79 is: 29.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.90 : 53.76 = 19.79 : x
  2. Step 2: Convert to fraction form
    35.90/53.76 = 19.79/x
  3. Step 3: Cross multiply
    35.90x = 53.76 × 19.79
  4. Step 4: Simplify right side
    35.90x = 1,063.91
  5. Step 5: Solve for x
    x = 1,063.91/35.90
  6. Step 6: Final answer
    x = 29.64

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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.