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Finding the Fourth Proportional to 64.81, 89.47 and 45.43

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Solution

The fourth proportional to 64.81, 89.47 and 45.43 is: 62.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.81 : 89.47 = 45.43 : x
  2. Step 2: Convert to fraction form
    64.81/89.47 = 45.43/x
  3. Step 3: Cross multiply
    64.81x = 89.47 × 45.43
  4. Step 4: Simplify right side
    64.81x = 4,064.62
  5. Step 5: Solve for x
    x = 4,064.62/64.81
  6. Step 6: Final answer
    x = 62.72

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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.