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Finding the Fourth Proportional to 139,342.01, 192,291.91 and 78,912.64

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Solution

The fourth proportional to 139,342.01, 192,291.91 and 78,912.64 is: 108,899.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,342.01 : 192,291.91 = 78,912.64 : x
  2. Step 2: Convert to fraction form
    139,342.01/192,291.91 = 78,912.64/x
  3. Step 3: Cross multiply
    139,342.01x = 192,291.91 × 78,912.64
  4. Step 4: Simplify right side
    139,342.01x = 15,174,261,590.73
  5. Step 5: Solve for x
    x = 15,174,261,590.73/139,342.01
  6. Step 6: Final answer
    x = 108,899.40

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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.