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Finding the Fourth Proportional to 64.51, 89.11 and 47

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Solution

The fourth proportional to 64.51, 89.11 and 47 is: 64.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.51 : 89.11 = 47 : x
  2. Step 2: Convert to fraction form
    64.51/89.11 = 47/x
  3. Step 3: Cross multiply
    64.51x = 89.11 × 47
  4. Step 4: Simplify right side
    64.51x = 4,187.94
  5. Step 5: Solve for x
    x = 4,187.94/64.51
  6. Step 6: Final answer
    x = 64.92

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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.