Home / 128,778.70-177,714.04-72,190.07

Finding the Fourth Proportional to 128,778.70, 177,714.04 and 72,190.07

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Solution

The fourth proportional to 128,778.70, 177,714.04 and 72,190.07 is: 99,621.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,778.70 : 177,714.04 = 72,190.07 : x
  2. Step 2: Convert to fraction form
    128,778.70/177,714.04 = 72,190.07/x
  3. Step 3: Cross multiply
    128,778.70x = 177,714.04 × 72,190.07
  4. Step 4: Simplify right side
    128,778.70x = 12,829,188,987.58
  5. Step 5: Solve for x
    x = 12,829,188,987.58/128,778.70
  6. Step 6: Final answer
    x = 99,621.98

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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.