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Finding the Fourth Proportional to 47.17, 70.43 and 43.39

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Solution

The fourth proportional to 47.17, 70.43 and 43.39 is: 64.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.17 : 70.43 = 43.39 : x
  2. Step 2: Convert to fraction form
    47.17/70.43 = 43.39/x
  3. Step 3: Cross multiply
    47.17x = 70.43 × 43.39
  4. Step 4: Simplify right side
    47.17x = 3,055.96
  5. Step 5: Solve for x
    x = 3,055.96/47.17
  6. Step 6: Final answer
    x = 64.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.