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Finding the Fourth Proportional to 35.52, 53.32 and 21.28

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Solution

The fourth proportional to 35.52, 53.32 and 21.28 is: 31.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.52 : 53.32 = 21.28 : x
  2. Step 2: Convert to fraction form
    35.52/53.32 = 21.28/x
  3. Step 3: Cross multiply
    35.52x = 53.32 × 21.28
  4. Step 4: Simplify right side
    35.52x = 1,134.65
  5. Step 5: Solve for x
    x = 1,134.65/35.52
  6. Step 6: Final answer
    x = 31.94

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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.