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Finding the Fourth Proportional to 392,021.20, 588,031.80 and 389,256.40

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Solution

The fourth proportional to 392,021.20, 588,031.80 and 389,256.40 is: 583,884.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,021.20 : 588,031.80 = 389,256.40 : x
  2. Step 2: Convert to fraction form
    392,021.20/588,031.80 = 389,256.40/x
  3. Step 3: Cross multiply
    392,021.20x = 588,031.80 × 389,256.40
  4. Step 4: Simplify right side
    392,021.20x = 228,895,141,553.52
  5. Step 5: Solve for x
    x = 228,895,141,553.52/392,021.20
  6. Step 6: Final answer
    x = 583,884.60

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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.