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Finding the Fourth Proportional to 647,404.90, 971,107.35 and 489,940.90

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Solution

The fourth proportional to 647,404.90, 971,107.35 and 489,940.90 is: 734,911.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,404.90 : 971,107.35 = 489,940.90 : x
  2. Step 2: Convert to fraction form
    647,404.90/971,107.35 = 489,940.90/x
  3. Step 3: Cross multiply
    647,404.90x = 971,107.35 × 489,940.90
  4. Step 4: Simplify right side
    647,404.90x = 475,785,209,055.62
  5. Step 5: Solve for x
    x = 475,785,209,055.62/647,404.90
  6. Step 6: Final answer
    x = 734,911.35

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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.