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Finding the Fourth Proportional to 40.15, 59.72 and 38.98

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Solution

The fourth proportional to 40.15, 59.72 and 38.98 is: 57.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.15 : 59.72 = 38.98 : x
  2. Step 2: Convert to fraction form
    40.15/59.72 = 38.98/x
  3. Step 3: Cross multiply
    40.15x = 59.72 × 38.98
  4. Step 4: Simplify right side
    40.15x = 2,327.89
  5. Step 5: Solve for x
    x = 2,327.89/40.15
  6. Step 6: Final answer
    x = 57.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.