Home / 31.48-47.25-30.15

Finding the Fourth Proportional to 31.48, 47.25 and 30.15

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Solution

The fourth proportional to 31.48, 47.25 and 30.15 is: 45.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.48 : 47.25 = 30.15 : x
  2. Step 2: Convert to fraction form
    31.48/47.25 = 30.15/x
  3. Step 3: Cross multiply
    31.48x = 47.25 × 30.15
  4. Step 4: Simplify right side
    31.48x = 1,424.59
  5. Step 5: Solve for x
    x = 1,424.59/31.48
  6. Step 6: Final answer
    x = 45.25

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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.