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Finding the Fourth Proportional to 43.80, 60.43 and 31.50

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Solution

The fourth proportional to 43.80, 60.43 and 31.50 is: 43.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.80 : 60.43 = 31.50 : x
  2. Step 2: Convert to fraction form
    43.80/60.43 = 31.50/x
  3. Step 3: Cross multiply
    43.80x = 60.43 × 31.50
  4. Step 4: Simplify right side
    43.80x = 1,903.16
  5. Step 5: Solve for x
    x = 1,903.16/43.80
  6. Step 6: Final answer
    x = 43.45

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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.