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Finding the Fourth Proportional to 139,006.40, 191,758.16 and 87,933.12

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Solution

The fourth proportional to 139,006.40, 191,758.16 and 87,933.12 is: 121,303.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,006.40 : 191,758.16 = 87,933.12 : x
  2. Step 2: Convert to fraction form
    139,006.40/191,758.16 = 87,933.12/x
  3. Step 3: Cross multiply
    139,006.40x = 191,758.16 × 87,933.12
  4. Step 4: Simplify right side
    139,006.40x = 16,861,893,294.26
  5. Step 5: Solve for x
    x = 16,861,893,294.26/139,006.40
  6. Step 6: Final answer
    x = 121,303.00

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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.