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Finding the Fourth Proportional to 31.45, 43.38 and 18.50

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Solution

The fourth proportional to 31.45, 43.38 and 18.50 is: 25.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.45 : 43.38 = 18.50 : x
  2. Step 2: Convert to fraction form
    31.45/43.38 = 18.50/x
  3. Step 3: Cross multiply
    31.45x = 43.38 × 18.50
  4. Step 4: Simplify right side
    31.45x = 802.53
  5. Step 5: Solve for x
    x = 802.53/31.45
  6. Step 6: Final answer
    x = 25.52

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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.