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Finding the Fourth Proportional to 40.65, 61.04 and 31.60

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Solution

The fourth proportional to 40.65, 61.04 and 31.60 is: 47.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.65 : 61.04 = 31.60 : x
  2. Step 2: Convert to fraction form
    40.65/61.04 = 31.60/x
  3. Step 3: Cross multiply
    40.65x = 61.04 × 31.60
  4. Step 4: Simplify right side
    40.65x = 1,928.86
  5. Step 5: Solve for x
    x = 1,928.86/40.65
  6. Step 6: Final answer
    x = 47.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.