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Finding the Fourth Proportional to 45.76, 63.15 and 31.21

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Solution

The fourth proportional to 45.76, 63.15 and 31.21 is: 43.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.76 : 63.15 = 31.21 : x
  2. Step 2: Convert to fraction form
    45.76/63.15 = 31.21/x
  3. Step 3: Cross multiply
    45.76x = 63.15 × 31.21
  4. Step 4: Simplify right side
    45.76x = 1,970.44
  5. Step 5: Solve for x
    x = 1,970.44/45.76
  6. Step 6: Final answer
    x = 43.07

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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.