Home / 128,720.40-193,080.60-109,280.40

Finding the Fourth Proportional to 128,720.40, 193,080.60 and 109,280.40

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Solution

The fourth proportional to 128,720.40, 193,080.60 and 109,280.40 is: 163,920.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.40 : 193,080.60 = 109,280.40 : x
  2. Step 2: Convert to fraction form
    128,720.40/193,080.60 = 109,280.40/x
  3. Step 3: Cross multiply
    128,720.40x = 193,080.60 × 109,280.40
  4. Step 4: Simplify right side
    128,720.40x = 21,099,925,200.24
  5. Step 5: Solve for x
    x = 21,099,925,200.24/128,720.40
  6. Step 6: Final answer
    x = 163,920.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.