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Finding the Fourth Proportional to 47.66, 71.53 and 21.99

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Solution

The fourth proportional to 47.66, 71.53 and 21.99 is: 33.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.66 : 71.53 = 21.99 : x
  2. Step 2: Convert to fraction form
    47.66/71.53 = 21.99/x
  3. Step 3: Cross multiply
    47.66x = 71.53 × 21.99
  4. Step 4: Simplify right side
    47.66x = 1,573.16
  5. Step 5: Solve for x
    x = 1,573.16/47.66
  6. Step 6: Final answer
    x = 33.01

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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.