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Finding the Fourth Proportional to 60.90, 83.94 and 47.09

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Solution

The fourth proportional to 60.90, 83.94 and 47.09 is: 64.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.90 : 83.94 = 47.09 : x
  2. Step 2: Convert to fraction form
    60.90/83.94 = 47.09/x
  3. Step 3: Cross multiply
    60.90x = 83.94 × 47.09
  4. Step 4: Simplify right side
    60.90x = 3,952.31
  5. Step 5: Solve for x
    x = 3,952.31/60.90
  6. Step 6: Final answer
    x = 64.90

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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.