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Finding the Fourth Proportional to 84.02, 115.78 and 56.35

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Solution

The fourth proportional to 84.02, 115.78 and 56.35 is: 77.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.02 : 115.78 = 56.35 : x
  2. Step 2: Convert to fraction form
    84.02/115.78 = 56.35/x
  3. Step 3: Cross multiply
    84.02x = 115.78 × 56.35
  4. Step 4: Simplify right side
    84.02x = 6,524.20
  5. Step 5: Solve for x
    x = 6,524.20/84.02
  6. Step 6: Final answer
    x = 77.65

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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.