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Finding the Fourth Proportional to 642,662.40, 963,993.60 and 518,246.40

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Solution

The fourth proportional to 642,662.40, 963,993.60 and 518,246.40 is: 777,369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,662.40 : 963,993.60 = 518,246.40 : x
  2. Step 2: Convert to fraction form
    642,662.40/963,993.60 = 518,246.40/x
  3. Step 3: Cross multiply
    642,662.40x = 963,993.60 × 518,246.40
  4. Step 4: Simplify right side
    642,662.40x = 499,586,212,823.04
  5. Step 5: Solve for x
    x = 499,586,212,823.04/642,662.40
  6. Step 6: Final answer
    x = 777,369.60

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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.