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Finding the Fourth Proportional to 408,886.20, 612,673.20 and 385,266.60

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Solution

The fourth proportional to 408,886.20, 612,673.20 and 385,266.60 is: 577,281.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,886.20 : 612,673.20 = 385,266.60 : x
  2. Step 2: Convert to fraction form
    408,886.20/612,673.20 = 385,266.60/x
  3. Step 3: Cross multiply
    408,886.20x = 612,673.20 × 385,266.60
  4. Step 4: Simplify right side
    408,886.20x = 236,042,520,675.12
  5. Step 5: Solve for x
    x = 236,042,520,675.12/408,886.20
  6. Step 6: Final answer
    x = 577,281.70

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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.