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Finding the Fourth Proportional to 139,320.74, 192,264.84 and 78,889.74

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Solution

The fourth proportional to 139,320.74, 192,264.84 and 78,889.74 is: 108,869.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,320.74 : 192,264.84 = 78,889.74 : x
  2. Step 2: Convert to fraction form
    139,320.74/192,264.84 = 78,889.74/x
  3. Step 3: Cross multiply
    139,320.74x = 192,264.84 × 78,889.74
  4. Step 4: Simplify right side
    139,320.74x = 15,167,723,238.74
  5. Step 5: Solve for x
    x = 15,167,723,238.74/139,320.74
  6. Step 6: Final answer
    x = 108,869.10

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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.