Home / 128,722.20-177,636.69-78,421.20

Finding the Fourth Proportional to 128,722.20, 177,636.69 and 78,421.20

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Solution

The fourth proportional to 128,722.20, 177,636.69 and 78,421.20 is: 108,221.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,722.20 : 177,636.69 = 78,421.20 : x
  2. Step 2: Convert to fraction form
    128,722.20/177,636.69 = 78,421.20/x
  3. Step 3: Cross multiply
    128,722.20x = 177,636.69 × 78,421.20
  4. Step 4: Simplify right side
    128,722.20x = 13,930,482,393.83
  5. Step 5: Solve for x
    x = 13,930,482,393.83/128,722.20
  6. Step 6: Final answer
    x = 108,221.29

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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.