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Finding the Fourth Proportional to 35.32, 48.75 and 21.51

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Solution

The fourth proportional to 35.32, 48.75 and 21.51 is: 29.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.32 : 48.75 = 21.51 : x
  2. Step 2: Convert to fraction form
    35.32/48.75 = 21.51/x
  3. Step 3: Cross multiply
    35.32x = 48.75 × 21.51
  4. Step 4: Simplify right side
    35.32x = 1,048.61
  5. Step 5: Solve for x
    x = 1,048.61/35.32
  6. Step 6: Final answer
    x = 29.69

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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.