Home / 139,136.40-192,008.30-78,705.78

Finding the Fourth Proportional to 139,136.40, 192,008.30 and 78,705.78

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Solution

The fourth proportional to 139,136.40, 192,008.30 and 78,705.78 is: 108,614.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,136.40 : 192,008.30 = 78,705.78 : x
  2. Step 2: Convert to fraction form
    139,136.40/192,008.30 = 78,705.78/x
  3. Step 3: Cross multiply
    139,136.40x = 192,008.30 × 78,705.78
  4. Step 4: Simplify right side
    139,136.40x = 15,112,163,017.97
  5. Step 5: Solve for x
    x = 15,112,163,017.97/139,136.40
  6. Step 6: Final answer
    x = 108,614.01

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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.