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Finding the Fourth Proportional to 85.68, 118.24 and 56.52

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Solution

The fourth proportional to 85.68, 118.24 and 56.52 is: 78.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.68 : 118.24 = 56.52 : x
  2. Step 2: Convert to fraction form
    85.68/118.24 = 56.52/x
  3. Step 3: Cross multiply
    85.68x = 118.24 × 56.52
  4. Step 4: Simplify right side
    85.68x = 6,682.92
  5. Step 5: Solve for x
    x = 6,682.92/85.68
  6. Step 6: Final answer
    x = 78.00

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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.