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Finding the Fourth Proportional to 61.80, 92.79 and 39.03

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Solution

The fourth proportional to 61.80, 92.79 and 39.03 is: 58.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.80 : 92.79 = 39.03 : x
  2. Step 2: Convert to fraction form
    61.80/92.79 = 39.03/x
  3. Step 3: Cross multiply
    61.80x = 92.79 × 39.03
  4. Step 4: Simplify right side
    61.80x = 3,621.59
  5. Step 5: Solve for x
    x = 3,621.59/61.80
  6. Step 6: Final answer
    x = 58.60

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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.