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Finding the Fourth Proportional to 128,523.60, 192,785.40 and 81,284.40

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Solution

The fourth proportional to 128,523.60, 192,785.40 and 81,284.40 is: 121,926.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,523.60 : 192,785.40 = 81,284.40 : x
  2. Step 2: Convert to fraction form
    128,523.60/192,785.40 = 81,284.40/x
  3. Step 3: Cross multiply
    128,523.60x = 192,785.40 × 81,284.40
  4. Step 4: Simplify right side
    128,523.60x = 15,670,445,567.76
  5. Step 5: Solve for x
    x = 15,670,445,567.76/128,523.60
  6. Step 6: Final answer
    x = 121,926.60

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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.