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Finding the Fourth Proportional to 85.60, 118.10 and 56.50

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Solution

The fourth proportional to 85.60, 118.10 and 56.50 is: 77.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.60 : 118.10 = 56.50 : x
  2. Step 2: Convert to fraction form
    85.60/118.10 = 56.50/x
  3. Step 3: Cross multiply
    85.60x = 118.10 × 56.50
  4. Step 4: Simplify right side
    85.60x = 6,672.65
  5. Step 5: Solve for x
    x = 6,672.65/85.60
  6. Step 6: Final answer
    x = 77.95

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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.