Home / 139,318.19-192,259.85-78,900.60

Finding the Fourth Proportional to 139,318.19, 192,259.85 and 78,900.60

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Solution

The fourth proportional to 139,318.19, 192,259.85 and 78,900.60 is: 108,883.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,318.19 : 192,259.85 = 78,900.60 : x
  2. Step 2: Convert to fraction form
    139,318.19/192,259.85 = 78,900.60/x
  3. Step 3: Cross multiply
    139,318.19x = 192,259.85 × 78,900.60
  4. Step 4: Simplify right side
    139,318.19x = 15,169,417,520.91
  5. Step 5: Solve for x
    x = 15,169,417,520.91/139,318.19
  6. Step 6: Final answer
    x = 108,883.25

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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.