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Finding the Fourth Proportional to 61.81, 85.21 and 51.46

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Solution

The fourth proportional to 61.81, 85.21 and 51.46 is: 70.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.81 : 85.21 = 51.46 : x
  2. Step 2: Convert to fraction form
    61.81/85.21 = 51.46/x
  3. Step 3: Cross multiply
    61.81x = 85.21 × 51.46
  4. Step 4: Simplify right side
    61.81x = 4,384.91
  5. Step 5: Solve for x
    x = 4,384.91/61.81
  6. Step 6: Final answer
    x = 70.94

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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.