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Finding the Fourth Proportional to 389,429.20, 584,143.80 and 239,838.40

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Solution

The fourth proportional to 389,429.20, 584,143.80 and 239,838.40 is: 359,757.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,429.20 : 584,143.80 = 239,838.40 : x
  2. Step 2: Convert to fraction form
    389,429.20/584,143.80 = 239,838.40/x
  3. Step 3: Cross multiply
    389,429.20x = 584,143.80 × 239,838.40
  4. Step 4: Simplify right side
    389,429.20x = 140,100,114,361.92
  5. Step 5: Solve for x
    x = 140,100,114,361.92/389,429.20
  6. Step 6: Final answer
    x = 359,757.60

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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.