Home / 139,217.12-192,116.76-78,786.68

Finding the Fourth Proportional to 139,217.12, 192,116.76 and 78,786.68

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Solution

The fourth proportional to 139,217.12, 192,116.76 and 78,786.68 is: 108,724.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,217.12 : 192,116.76 = 78,786.68 : x
  2. Step 2: Convert to fraction form
    139,217.12/192,116.76 = 78,786.68/x
  3. Step 3: Cross multiply
    139,217.12x = 192,116.76 × 78,786.68
  4. Step 4: Simplify right side
    139,217.12x = 15,136,241,692.76
  5. Step 5: Solve for x
    x = 15,136,241,692.76/139,217.12
  6. Step 6: Final answer
    x = 108,724.00

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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.