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Finding the Fourth Proportional to 47.07, 64.91 and 30.71

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Solution

The fourth proportional to 47.07, 64.91 and 30.71 is: 42.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.07 : 64.91 = 30.71 : x
  2. Step 2: Convert to fraction form
    47.07/64.91 = 30.71/x
  3. Step 3: Cross multiply
    47.07x = 64.91 × 30.71
  4. Step 4: Simplify right side
    47.07x = 1,993.63
  5. Step 5: Solve for x
    x = 1,993.63/47.07
  6. Step 6: Final answer
    x = 42.35

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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.