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Finding the Fourth Proportional to 386,168.40, 578,086.20 and 339,512.40

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Solution

The fourth proportional to 386,168.40, 578,086.20 and 339,512.40 is: 508,243.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,168.40 : 578,086.20 = 339,512.40 : x
  2. Step 2: Convert to fraction form
    386,168.40/578,086.20 = 339,512.40/x
  3. Step 3: Cross multiply
    386,168.40x = 578,086.20 × 339,512.40
  4. Step 4: Simplify right side
    386,168.40x = 196,267,433,168.88
  5. Step 5: Solve for x
    x = 196,267,433,168.88/386,168.40
  6. Step 6: Final answer
    x = 508,243.12

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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.