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Finding the Fourth Proportional to 29.17, 40.18 and 21.39

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Solution

The fourth proportional to 29.17, 40.18 and 21.39 is: 29.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.17 : 40.18 = 21.39 : x
  2. Step 2: Convert to fraction form
    29.17/40.18 = 21.39/x
  3. Step 3: Cross multiply
    29.17x = 40.18 × 21.39
  4. Step 4: Simplify right side
    29.17x = 859.14
  5. Step 5: Solve for x
    x = 859.14/29.17
  6. Step 6: Final answer
    x = 29.45

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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.