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Finding the Fourth Proportional to 61.24, 84.36 and 47.40

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Solution

The fourth proportional to 61.24, 84.36 and 47.40 is: 65.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.24 : 84.36 = 47.40 : x
  2. Step 2: Convert to fraction form
    61.24/84.36 = 47.40/x
  3. Step 3: Cross multiply
    61.24x = 84.36 × 47.40
  4. Step 4: Simplify right side
    61.24x = 3,998.66
  5. Step 5: Solve for x
    x = 3,998.66/61.24
  6. Step 6: Final answer
    x = 65.29

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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.