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Finding the Fourth Proportional to 85,728.72, 118,286.50 and 51,742.76

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Solution

The fourth proportional to 85,728.72, 118,286.50 and 51,742.76 is: 71,393.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,728.72 : 118,286.50 = 51,742.76 : x
  2. Step 2: Convert to fraction form
    85,728.72/118,286.50 = 51,742.76/x
  3. Step 3: Cross multiply
    85,728.72x = 118,286.50 × 51,742.76
  4. Step 4: Simplify right side
    85,728.72x = 6,120,469,980.74
  5. Step 5: Solve for x
    x = 6,120,469,980.74/85,728.72
  6. Step 6: Final answer
    x = 71,393.46

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1.5x scale

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.