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Finding the Fourth Proportional to 61.87, 85.36 and 40.02

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Solution

The fourth proportional to 61.87, 85.36 and 40.02 is: 55.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.87 : 85.36 = 40.02 : x
  2. Step 2: Convert to fraction form
    61.87/85.36 = 40.02/x
  3. Step 3: Cross multiply
    61.87x = 85.36 × 40.02
  4. Step 4: Simplify right side
    61.87x = 3,416.11
  5. Step 5: Solve for x
    x = 3,416.11/61.87
  6. Step 6: Final answer
    x = 55.21

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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.