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Finding the Fourth Proportional to 46.71, 64.32 and 39.79

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Solution

The fourth proportional to 46.71, 64.32 and 39.79 is: 54.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.71 : 64.32 = 39.79 : x
  2. Step 2: Convert to fraction form
    46.71/64.32 = 39.79/x
  3. Step 3: Cross multiply
    46.71x = 64.32 × 39.79
  4. Step 4: Simplify right side
    46.71x = 2,559.29
  5. Step 5: Solve for x
    x = 2,559.29/46.71
  6. Step 6: Final answer
    x = 54.79

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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.