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Finding the Fourth Proportional to 61.31, 84.65 and 57.23

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Solution

The fourth proportional to 61.31, 84.65 and 57.23 is: 79.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.31 : 84.65 = 57.23 : x
  2. Step 2: Convert to fraction form
    61.31/84.65 = 57.23/x
  3. Step 3: Cross multiply
    61.31x = 84.65 × 57.23
  4. Step 4: Simplify right side
    61.31x = 4,843.81
  5. Step 5: Solve for x
    x = 4,843.81/61.31
  6. Step 6: Final answer
    x = 79.01

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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.