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Finding the Fourth Proportional to 44.15, 66.18 and 21.30

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Solution

The fourth proportional to 44.15, 66.18 and 21.30 is: 31.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.15 : 66.18 = 21.30 : x
  2. Step 2: Convert to fraction form
    44.15/66.18 = 21.30/x
  3. Step 3: Cross multiply
    44.15x = 66.18 × 21.30
  4. Step 4: Simplify right side
    44.15x = 1,409.47
  5. Step 5: Solve for x
    x = 1,409.47/44.15
  6. Step 6: Final answer
    x = 31.93

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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.