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Finding the Fourth Proportional to 612,985.20, 919,477.80 and 443,711.40

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Solution

The fourth proportional to 612,985.20, 919,477.80 and 443,711.40 is: 665,567.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,985.20 : 919,477.80 = 443,711.40 : x
  2. Step 2: Convert to fraction form
    612,985.20/919,477.80 = 443,711.40/x
  3. Step 3: Cross multiply
    612,985.20x = 919,477.80 × 443,711.40
  4. Step 4: Simplify right side
    612,985.20x = 407,982,781,906.92
  5. Step 5: Solve for x
    x = 407,982,781,906.92/612,985.20
  6. Step 6: Final answer
    x = 665,567.10

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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.