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Finding the Fourth Proportional to 35.52, 49.20 and 31.20

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Solution

The fourth proportional to 35.52, 49.20 and 31.20 is: 43.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.52 : 49.20 = 31.20 : x
  2. Step 2: Convert to fraction form
    35.52/49.20 = 31.20/x
  3. Step 3: Cross multiply
    35.52x = 49.20 × 31.20
  4. Step 4: Simplify right side
    35.52x = 1,535.04
  5. Step 5: Solve for x
    x = 1,535.04/35.52
  6. Step 6: Final answer
    x = 43.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.