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Finding the Fourth Proportional to 61.99, 85.71 and 54.70

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Solution

The fourth proportional to 61.99, 85.71 and 54.70 is: 75.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.99 : 85.71 = 54.70 : x
  2. Step 2: Convert to fraction form
    61.99/85.71 = 54.70/x
  3. Step 3: Cross multiply
    61.99x = 85.71 × 54.70
  4. Step 4: Simplify right side
    61.99x = 4,688.34
  5. Step 5: Solve for x
    x = 4,688.34/61.99
  6. Step 6: Final answer
    x = 75.63

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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.