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Finding the Fourth Proportional to 612,720.20, 919,080.30 and 443,446.40

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Solution

The fourth proportional to 612,720.20, 919,080.30 and 443,446.40 is: 665,169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,720.20 : 919,080.30 = 443,446.40 : x
  2. Step 2: Convert to fraction form
    612,720.20/919,080.30 = 443,446.40/x
  3. Step 3: Cross multiply
    612,720.20x = 919,080.30 × 443,446.40
  4. Step 4: Simplify right side
    612,720.20x = 407,562,850,345.92
  5. Step 5: Solve for x
    x = 407,562,850,345.92/612,720.20
  6. Step 6: Final answer
    x = 665,169.60

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Similar ratio
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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.