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Finding the Fourth Proportional to 64.87, 89.42 and 47.35

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Solution

The fourth proportional to 64.87, 89.42 and 47.35 is: 65.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.87 : 89.42 = 47.35 : x
  2. Step 2: Convert to fraction form
    64.87/89.42 = 47.35/x
  3. Step 3: Cross multiply
    64.87x = 89.42 × 47.35
  4. Step 4: Simplify right side
    64.87x = 4,233.93
  5. Step 5: Solve for x
    x = 4,233.93/64.87
  6. Step 6: Final answer
    x = 65.27

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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.