Home / 78,221.41-117,140.75-70,639.82

Finding the Fourth Proportional to 78,221.41, 117,140.75 and 70,639.82

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Solution

The fourth proportional to 78,221.41, 117,140.75 and 70,639.82 is: 105,786.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,221.41 : 117,140.75 = 70,639.82 : x
  2. Step 2: Convert to fraction form
    78,221.41/117,140.75 = 70,639.82/x
  3. Step 3: Cross multiply
    78,221.41x = 117,140.75 × 70,639.82
  4. Step 4: Simplify right side
    78,221.41x = 8,274,800,555.76
  5. Step 5: Solve for x
    x = 8,274,800,555.76/78,221.41
  6. Step 6: Final answer
    x = 105,786.90

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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.