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Finding the Fourth Proportional to 84.75, 117.03 and 57.20

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Solution

The fourth proportional to 84.75, 117.03 and 57.20 is: 78.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.75 : 117.03 = 57.20 : x
  2. Step 2: Convert to fraction form
    84.75/117.03 = 57.20/x
  3. Step 3: Cross multiply
    84.75x = 117.03 × 57.20
  4. Step 4: Simplify right side
    84.75x = 6,693.53
  5. Step 5: Solve for x
    x = 6,693.53/84.75
  6. Step 6: Final answer
    x = 78.98

Related Problems

Find fourth proportional to 42.38, 58.52 and 28.60
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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.