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Finding the Fourth Proportional to 128,408.10, 192,612.15 and 91,010.40

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Solution

The fourth proportional to 128,408.10, 192,612.15 and 91,010.40 is: 136,515.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,408.10 : 192,612.15 = 91,010.40 : x
  2. Step 2: Convert to fraction form
    128,408.10/192,612.15 = 91,010.40/x
  3. Step 3: Cross multiply
    128,408.10x = 192,612.15 × 91,010.40
  4. Step 4: Simplify right side
    128,408.10x = 17,529,708,816.36
  5. Step 5: Solve for x
    x = 17,529,708,816.36/128,408.10
  6. Step 6: Final answer
    x = 136,515.60

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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.