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Finding the Fourth Proportional to 139,190.13, 208,785.09 and 79,988.04

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Solution

The fourth proportional to 139,190.13, 208,785.09 and 79,988.04 is: 119,982.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,190.13 : 208,785.09 = 79,988.04 : x
  2. Step 2: Convert to fraction form
    139,190.13/208,785.09 = 79,988.04/x
  3. Step 3: Cross multiply
    139,190.13x = 208,785.09 × 79,988.04
  4. Step 4: Simplify right side
    139,190.13x = 16,700,310,130.32
  5. Step 5: Solve for x
    x = 16,700,310,130.32/139,190.13
  6. Step 6: Final answer
    x = 119,982.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.