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Finding the Fourth Proportional to 84.28, 116.36 and 56.70

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Solution

The fourth proportional to 84.28, 116.36 and 56.70 is: 78.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.28 : 116.36 = 56.70 : x
  2. Step 2: Convert to fraction form
    84.28/116.36 = 56.70/x
  3. Step 3: Cross multiply
    84.28x = 116.36 × 56.70
  4. Step 4: Simplify right side
    84.28x = 6,597.61
  5. Step 5: Solve for x
    x = 6,597.61/84.28
  6. Step 6: Final answer
    x = 78.28

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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.