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Finding the Fourth Proportional to 320,816.70, 480,641.85 and 261,330.30

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Solution

The fourth proportional to 320,816.70, 480,641.85 and 261,330.30 is: 391,520.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,816.70 : 480,641.85 = 261,330.30 : x
  2. Step 2: Convert to fraction form
    320,816.70/480,641.85 = 261,330.30/x
  3. Step 3: Cross multiply
    320,816.70x = 480,641.85 × 261,330.30
  4. Step 4: Simplify right side
    320,816.70x = 125,606,278,853.06
  5. Step 5: Solve for x
    x = 125,606,278,853.06/320,816.70
  6. Step 6: Final answer
    x = 391,520.39

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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.