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Finding the Fourth Proportional to 45.61, 62.96 and 31.07

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Solution

The fourth proportional to 45.61, 62.96 and 31.07 is: 42.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.61 : 62.96 = 31.07 : x
  2. Step 2: Convert to fraction form
    45.61/62.96 = 31.07/x
  3. Step 3: Cross multiply
    45.61x = 62.96 × 31.07
  4. Step 4: Simplify right side
    45.61x = 1,956.24
  5. Step 5: Solve for x
    x = 1,956.24/45.61
  6. Step 6: Final answer
    x = 42.90

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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.