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Finding the Fourth Proportional to 45.72, 63.12 and 31.20

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Solution

The fourth proportional to 45.72, 63.12 and 31.20 is: 43.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.72 : 63.12 = 31.20 : x
  2. Step 2: Convert to fraction form
    45.72/63.12 = 31.20/x
  3. Step 3: Cross multiply
    45.72x = 63.12 × 31.20
  4. Step 4: Simplify right side
    45.72x = 1,969.34
  5. Step 5: Solve for x
    x = 1,969.34/45.72
  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.