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Finding the Fourth Proportional to 128,465.90, 192,670.05 and 84,401.90

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Solution

The fourth proportional to 128,465.90, 192,670.05 and 84,401.90 is: 126,583.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,465.90 : 192,670.05 = 84,401.90 : x
  2. Step 2: Convert to fraction form
    128,465.90/192,670.05 = 84,401.90/x
  3. Step 3: Cross multiply
    128,465.90x = 192,670.05 × 84,401.90
  4. Step 4: Simplify right side
    128,465.90x = 16,261,718,293.10
  5. Step 5: Solve for x
    x = 16,261,718,293.10/128,465.90
  6. Step 6: Final answer
    x = 126,583.93

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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.