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Finding the Fourth Proportional to 47.06, 64.78 and 40.14

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Solution

The fourth proportional to 47.06, 64.78 and 40.14 is: 55.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.06 : 64.78 = 40.14 : x
  2. Step 2: Convert to fraction form
    47.06/64.78 = 40.14/x
  3. Step 3: Cross multiply
    47.06x = 64.78 × 40.14
  4. Step 4: Simplify right side
    47.06x = 2,600.27
  5. Step 5: Solve for x
    x = 2,600.27/47.06
  6. Step 6: Final answer
    x = 55.25

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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.