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Finding the Fourth Proportional to 46.74, 64.40 and 39.86

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Solution

The fourth proportional to 46.74, 64.40 and 39.86 is: 54.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.74 : 64.40 = 39.86 : x
  2. Step 2: Convert to fraction form
    46.74/64.40 = 39.86/x
  3. Step 3: Cross multiply
    46.74x = 64.40 × 39.86
  4. Step 4: Simplify right side
    46.74x = 2,566.46
  5. Step 5: Solve for x
    x = 2,566.46/46.74
  6. Step 6: Final answer
    x = 54.91

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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.