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Finding the Fourth Proportional to 84.95, 117.25 and 55.40

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Solution

The fourth proportional to 84.95, 117.25 and 55.40 is: 76.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.95 : 117.25 = 55.40 : x
  2. Step 2: Convert to fraction form
    84.95/117.25 = 55.40/x
  3. Step 3: Cross multiply
    84.95x = 117.25 × 55.40
  4. Step 4: Simplify right side
    84.95x = 6,495.37
  5. Step 5: Solve for x
    x = 6,495.37/84.95
  6. Step 6: Final answer
    x = 76.47

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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.