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Finding the Fourth Proportional to 84.95, 117.26 and 61.63

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Solution

The fourth proportional to 84.95, 117.26 and 61.63 is: 85.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.95 : 117.26 = 61.63 : x
  2. Step 2: Convert to fraction form
    84.95/117.26 = 61.63/x
  3. Step 3: Cross multiply
    84.95x = 117.26 × 61.63
  4. Step 4: Simplify right side
    84.95x = 7,225.84
  5. Step 5: Solve for x
    x = 7,225.84/84.95
  6. Step 6: Final answer
    x = 85.06

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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.