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Finding the Fourth Proportional to 47.10, 64.64 and 42.47

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Solution

The fourth proportional to 47.10, 64.64 and 42.47 is: 58.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.10 : 64.64 = 42.47 : x
  2. Step 2: Convert to fraction form
    47.10/64.64 = 42.47/x
  3. Step 3: Cross multiply
    47.10x = 64.64 × 42.47
  4. Step 4: Simplify right side
    47.10x = 2,745.26
  5. Step 5: Solve for x
    x = 2,745.26/47.10
  6. Step 6: Final answer
    x = 58.29

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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.