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Finding the Fourth Proportional to 911,478.96, 1,367,221.80 and 280,388.40

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Solution

The fourth proportional to 911,478.96, 1,367,221.80 and 280,388.40 is: 420,583.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,478.96 : 1,367,221.80 = 280,388.40 : x
  2. Step 2: Convert to fraction form
    911,478.96/1,367,221.80 = 280,388.40/x
  3. Step 3: Cross multiply
    911,478.96x = 1,367,221.80 × 280,388.40
  4. Step 4: Simplify right side
    911,478.96x = 383,353,132,947.12
  5. Step 5: Solve for x
    x = 383,353,132,947.12/911,478.96
  6. Step 6: Final answer
    x = 420,583.63

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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.