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Finding the Fourth Proportional to 35.19, 48.56 and 21.18

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Solution

The fourth proportional to 35.19, 48.56 and 21.18 is: 29.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.19 : 48.56 = 21.18 : x
  2. Step 2: Convert to fraction form
    35.19/48.56 = 21.18/x
  3. Step 3: Cross multiply
    35.19x = 48.56 × 21.18
  4. Step 4: Simplify right side
    35.19x = 1,028.39
  5. Step 5: Solve for x
    x = 1,028.39/35.19
  6. Step 6: Final answer
    x = 29.22

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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.