Home / 136,721.70-188,647.78-78,567.20

Finding the Fourth Proportional to 136,721.70, 188,647.78 and 78,567.20

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Solution

The fourth proportional to 136,721.70, 188,647.78 and 78,567.20 is: 108,406.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,721.70 : 188,647.78 = 78,567.20 : x
  2. Step 2: Convert to fraction form
    136,721.70/188,647.78 = 78,567.20/x
  3. Step 3: Cross multiply
    136,721.70x = 188,647.78 × 78,567.20
  4. Step 4: Simplify right side
    136,721.70x = 14,821,527,860.82
  5. Step 5: Solve for x
    x = 14,821,527,860.82/136,721.70
  6. Step 6: Final answer
    x = 108,406.55

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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.