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Finding the Fourth Proportional to 389,903.40, 584,855.10 and 326,917.80

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Solution

The fourth proportional to 389,903.40, 584,855.10 and 326,917.80 is: 490,376.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,903.40 : 584,855.10 = 326,917.80 : x
  2. Step 2: Convert to fraction form
    389,903.40/584,855.10 = 326,917.80/x
  3. Step 3: Cross multiply
    389,903.40x = 584,855.10 × 326,917.80
  4. Step 4: Simplify right side
    389,903.40x = 191,199,542,610.78
  5. Step 5: Solve for x
    x = 191,199,542,610.78/389,903.40
  6. Step 6: Final answer
    x = 490,376.70

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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.