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Finding the Fourth Proportional to 128,420.10, 192,630.15 and 120,644.10

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Solution

The fourth proportional to 128,420.10, 192,630.15 and 120,644.10 is: 180,966.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.10 : 192,630.15 = 120,644.10 : x
  2. Step 2: Convert to fraction form
    128,420.10/192,630.15 = 120,644.10/x
  3. Step 3: Cross multiply
    128,420.10x = 192,630.15 × 120,644.10
  4. Step 4: Simplify right side
    128,420.10x = 23,239,691,079.62
  5. Step 5: Solve for x
    x = 23,239,691,079.62/128,420.10
  6. Step 6: Final answer
    x = 180,966.15

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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.