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Finding the Fourth Proportional to 35.90, 49.53 and 21.15

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Solution

The fourth proportional to 35.90, 49.53 and 21.15 is: 29.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.90 : 49.53 = 21.15 : x
  2. Step 2: Convert to fraction form
    35.90/49.53 = 21.15/x
  3. Step 3: Cross multiply
    35.90x = 49.53 × 21.15
  4. Step 4: Simplify right side
    35.90x = 1,047.31
  5. Step 5: Solve for x
    x = 1,047.31/35.90
  6. Step 6: Final answer
    x = 29.18

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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.