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Finding the Fourth Proportional to 647,571.80, 971,357.70 and 643,424.60

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Solution

The fourth proportional to 647,571.80, 971,357.70 and 643,424.60 is: 965,136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,571.80 : 971,357.70 = 643,424.60 : x
  2. Step 2: Convert to fraction form
    647,571.80/971,357.70 = 643,424.60/x
  3. Step 3: Cross multiply
    647,571.80x = 971,357.70 × 643,424.60
  4. Step 4: Simplify right side
    647,571.80x = 624,995,439,579.42
  5. Step 5: Solve for x
    x = 624,995,439,579.42/647,571.80
  6. Step 6: Final answer
    x = 965,136.90

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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.