Home / 723,478.80-1,085,218.20-643,299.60

Finding the Fourth Proportional to 723,478.80, 1,085,218.20 and 643,299.60

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Solution

The fourth proportional to 723,478.80, 1,085,218.20 and 643,299.60 is: 964,949.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    723,478.80 : 1,085,218.20 = 643,299.60 : x
  2. Step 2: Convert to fraction form
    723,478.80/1,085,218.20 = 643,299.60/x
  3. Step 3: Cross multiply
    723,478.80x = 1,085,218.20 × 643,299.60
  4. Step 4: Simplify right side
    723,478.80x = 698,120,433,972.72
  5. Step 5: Solve for x
    x = 698,120,433,972.72/723,478.80
  6. Step 6: Final answer
    x = 964,949.40

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Double scale
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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.