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Finding the Fourth Proportional to 128,114.10, 192,171.15 and 90,716.40

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Solution

The fourth proportional to 128,114.10, 192,171.15 and 90,716.40 is: 136,074.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,114.10 : 192,171.15 = 90,716.40 : x
  2. Step 2: Convert to fraction form
    128,114.10/192,171.15 = 90,716.40/x
  3. Step 3: Cross multiply
    128,114.10x = 192,171.15 × 90,716.40
  4. Step 4: Simplify right side
    128,114.10x = 17,433,074,911.86
  5. Step 5: Solve for x
    x = 17,433,074,911.86/128,114.10
  6. Step 6: Final answer
    x = 136,074.60

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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.