Home / 142,889.81-197,190.99-78,360.55

Finding the Fourth Proportional to 142,889.81, 197,190.99 and 78,360.55

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Solution

The fourth proportional to 142,889.81, 197,190.99 and 78,360.55 is: 108,139.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,889.81 : 197,190.99 = 78,360.55 : x
  2. Step 2: Convert to fraction form
    142,889.81/197,190.99 = 78,360.55/x
  3. Step 3: Cross multiply
    142,889.81x = 197,190.99 × 78,360.55
  4. Step 4: Simplify right side
    142,889.81x = 15,451,993,938.47
  5. Step 5: Solve for x
    x = 15,451,993,938.47/142,889.81
  6. Step 6: Final answer
    x = 108,139.23

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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.