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Finding the Fourth Proportional to 45.58, 62.78 and 31.74

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Solution

The fourth proportional to 45.58, 62.78 and 31.74 is: 43.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.58 : 62.78 = 31.74 : x
  2. Step 2: Convert to fraction form
    45.58/62.78 = 31.74/x
  3. Step 3: Cross multiply
    45.58x = 62.78 × 31.74
  4. Step 4: Simplify right side
    45.58x = 1,992.32
  5. Step 5: Solve for x
    x = 1,992.32/45.58
  6. Step 6: Final answer
    x = 43.72

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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.