Home / 139,357.67-192,280.64-81,999.47

Finding the Fourth Proportional to 139,357.67, 192,280.64 and 81,999.47

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Solution

The fourth proportional to 139,357.67, 192,280.64 and 81,999.47 is: 113,139.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,357.67 : 192,280.64 = 81,999.47 : x
  2. Step 2: Convert to fraction form
    139,357.67/192,280.64 = 81,999.47/x
  3. Step 3: Cross multiply
    139,357.67x = 192,280.64 × 81,999.47
  4. Step 4: Simplify right side
    139,357.67x = 15,766,910,641.97
  5. Step 5: Solve for x
    x = 15,766,910,641.97/139,357.67
  6. Step 6: Final answer
    x = 113,139.89

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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.