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Finding the Fourth Proportional to 64.91, 89.61 and 47.47

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Solution

The fourth proportional to 64.91, 89.61 and 47.47 is: 65.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.91 : 89.61 = 47.47 : x
  2. Step 2: Convert to fraction form
    64.91/89.61 = 47.47/x
  3. Step 3: Cross multiply
    64.91x = 89.61 × 47.47
  4. Step 4: Simplify right side
    64.91x = 4,253.79
  5. Step 5: Solve for x
    x = 4,253.79/64.91
  6. Step 6: Final answer
    x = 65.53

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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.