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Finding the Fourth Proportional to 139,287.24, 192,143.88 and 85,584.24

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Solution

The fourth proportional to 139,287.24, 192,143.88 and 85,584.24 is: 118,061.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,287.24 : 192,143.88 = 85,584.24 : x
  2. Step 2: Convert to fraction form
    139,287.24/192,143.88 = 85,584.24/x
  3. Step 3: Cross multiply
    139,287.24x = 192,143.88 × 85,584.24
  4. Step 4: Simplify right side
    139,287.24x = 16,444,487,940.45
  5. Step 5: Solve for x
    x = 16,444,487,940.45/139,287.24
  6. Step 6: Final answer
    x = 118,061.70

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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.