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Finding the Fourth Proportional to 642,414.60, 963,621.90 and 617,920.20

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Solution

The fourth proportional to 642,414.60, 963,621.90 and 617,920.20 is: 926,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,414.60 : 963,621.90 = 617,920.20 : x
  2. Step 2: Convert to fraction form
    642,414.60/963,621.90 = 617,920.20/x
  3. Step 3: Cross multiply
    642,414.60x = 963,621.90 × 617,920.20
  4. Step 4: Simplify right side
    642,414.60x = 595,441,437,172.38
  5. Step 5: Solve for x
    x = 595,441,437,172.38/642,414.60
  6. Step 6: Final answer
    x = 926,880.30

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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.