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Finding the Fourth Proportional to 389,440.60, 584,391.30 and 256,704.60

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Solution

The fourth proportional to 389,440.60, 584,391.30 and 256,704.60 is: 385,208.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,440.60 : 584,391.30 = 256,704.60 : x
  2. Step 2: Convert to fraction form
    389,440.60/584,391.30 = 256,704.60/x
  3. Step 3: Cross multiply
    389,440.60x = 584,391.30 × 256,704.60
  4. Step 4: Simplify right side
    389,440.60x = 150,015,934,909.98
  5. Step 5: Solve for x
    x = 150,015,934,909.98/389,440.60
  6. Step 6: Final answer
    x = 385,208.77

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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.