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Finding the Fourth Proportional to 61.63, 85.01 and 47.11

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Solution

The fourth proportional to 61.63, 85.01 and 47.11 is: 64.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.63 : 85.01 = 47.11 : x
  2. Step 2: Convert to fraction form
    61.63/85.01 = 47.11/x
  3. Step 3: Cross multiply
    61.63x = 85.01 × 47.11
  4. Step 4: Simplify right side
    61.63x = 4,004.59
  5. Step 5: Solve for x
    x = 4,004.59/61.63
  6. Step 6: Final answer
    x = 64.98

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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.