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Finding the Fourth Proportional to 128,859.60, 193,289.40 and 120,111.60

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Solution

The fourth proportional to 128,859.60, 193,289.40 and 120,111.60 is: 180,167.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,859.60 : 193,289.40 = 120,111.60 : x
  2. Step 2: Convert to fraction form
    128,859.60/193,289.40 = 120,111.60/x
  3. Step 3: Cross multiply
    128,859.60x = 193,289.40 × 120,111.60
  4. Step 4: Simplify right side
    128,859.60x = 23,216,299,097.04
  5. Step 5: Solve for x
    x = 23,216,299,097.04/128,859.60
  6. Step 6: Final answer
    x = 180,167.40

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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.