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Finding the Fourth Proportional to 46.86, 64.60 and 39.50

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Solution

The fourth proportional to 46.86, 64.60 and 39.50 is: 54.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    46.86 : 64.60 = 39.50 : x
  2. Step 2: Convert to fraction form
    46.86/64.60 = 39.50/x
  3. Step 3: Cross multiply
    46.86x = 64.60 × 39.50
  4. Step 4: Simplify right side
    46.86x = 2,551.70
  5. Step 5: Solve for x
    x = 2,551.70/46.86
  6. Step 6: Final answer
    x = 54.45

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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.