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Finding the Fourth Proportional to 647,427.80, 971,141.70 and 643,280.60

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Solution

The fourth proportional to 647,427.80, 971,141.70 and 643,280.60 is: 964,920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,427.80 : 971,141.70 = 643,280.60 : x
  2. Step 2: Convert to fraction form
    647,427.80/971,141.70 = 643,280.60/x
  3. Step 3: Cross multiply
    647,427.80x = 971,141.70 × 643,280.60
  4. Step 4: Simplify right side
    647,427.80x = 624,716,615,461.02
  5. Step 5: Solve for x
    x = 624,716,615,461.02/647,427.80
  6. Step 6: Final answer
    x = 964,920.90

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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.