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Finding the Fourth Proportional to 128,591.60, 177,435.72 and 80,811.12

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Solution

The fourth proportional to 128,591.60, 177,435.72 and 80,811.12 is: 111,506.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,591.60 : 177,435.72 = 80,811.12 : x
  2. Step 2: Convert to fraction form
    128,591.60/177,435.72 = 80,811.12/x
  3. Step 3: Cross multiply
    128,591.60x = 177,435.72 × 80,811.12
  4. Step 4: Simplify right side
    128,591.60x = 14,338,779,261.21
  5. Step 5: Solve for x
    x = 14,338,779,261.21/128,591.60
  6. Step 6: Final answer
    x = 111,506.34

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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.