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Finding the Fourth Proportional to 128,783.58, 177,719.67 and 72,194.46

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Solution

The fourth proportional to 128,783.58, 177,719.67 and 72,194.46 is: 99,627.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,783.58 : 177,719.67 = 72,194.46 : x
  2. Step 2: Convert to fraction form
    128,783.58/177,719.67 = 72,194.46/x
  3. Step 3: Cross multiply
    128,783.58x = 177,719.67 × 72,194.46
  4. Step 4: Simplify right side
    128,783.58x = 12,830,375,607.03
  5. Step 5: Solve for x
    x = 12,830,375,607.03/128,783.58
  6. Step 6: Final answer
    x = 99,627.42

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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.