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Finding the Fourth Proportional to 78,785.70, 108,764.38 and 60,840.42

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Solution

The fourth proportional to 78,785.70, 108,764.38 and 60,840.42 is: 83,990.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,785.70 : 108,764.38 = 60,840.42 : x
  2. Step 2: Convert to fraction form
    78,785.70/108,764.38 = 60,840.42/x
  3. Step 3: Cross multiply
    78,785.70x = 108,764.38 × 60,840.42
  4. Step 4: Simplify right side
    78,785.70x = 6,617,270,560.24
  5. Step 5: Solve for x
    x = 6,617,270,560.24/78,785.70
  6. Step 6: Final answer
    x = 83,990.76

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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.