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Finding the Fourth Proportional to 647,439.80, 971,159.70 and 643,292.60

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Solution

The fourth proportional to 647,439.80, 971,159.70 and 643,292.60 is: 964,938.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,439.80 : 971,159.70 = 643,292.60 : x
  2. Step 2: Convert to fraction form
    647,439.80/971,159.70 = 643,292.60/x
  3. Step 3: Cross multiply
    647,439.80x = 971,159.70 × 643,292.60
  4. Step 4: Simplify right side
    647,439.80x = 624,739,848,428.22
  5. Step 5: Solve for x
    x = 624,739,848,428.22/647,439.80
  6. Step 6: Final answer
    x = 964,938.90

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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.