Home / 136,333.90-188,139-78,981.04

Finding the Fourth Proportional to 136,333.90, 188,139 and 78,981.04

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Solution

The fourth proportional to 136,333.90, 188,139 and 78,981.04 is: 108,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,333.90 : 188,139 = 78,981.04 : x
  2. Step 2: Convert to fraction form
    136,333.90/188,139 = 78,981.04/x
  3. Step 3: Cross multiply
    136,333.90x = 188,139 × 78,981.04
  4. Step 4: Simplify right side
    136,333.90x = 14,859,413,884.56
  5. Step 5: Solve for x
    x = 14,859,413,884.56/136,333.90
  6. Step 6: Final answer
    x = 108,992.80

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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.