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Finding the Fourth Proportional to 47.00, 64.49 and 42.87

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Solution

The fourth proportional to 47.00, 64.49 and 42.87 is: 58.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.00 : 64.49 = 42.87 : x
  2. Step 2: Convert to fraction form
    47.00/64.49 = 42.87/x
  3. Step 3: Cross multiply
    47.00x = 64.49 × 42.87
  4. Step 4: Simplify right side
    47.00x = 2,764.47
  5. Step 5: Solve for x
    x = 2,764.47/47.00
  6. Step 6: Final answer
    x = 58.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.