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Finding the Fourth Proportional to 46.91, 64.70 and 30.56

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Solution

The fourth proportional to 46.91, 64.70 and 30.56 is: 42.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.91 : 64.70 = 30.56 : x
  2. Step 2: Convert to fraction form
    46.91/64.70 = 30.56/x
  3. Step 3: Cross multiply
    46.91x = 64.70 × 30.56
  4. Step 4: Simplify right side
    46.91x = 1,976.76
  5. Step 5: Solve for x
    x = 1,976.76/46.91
  6. Step 6: Final answer
    x = 42.14

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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.