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Finding the Fourth Proportional to 978,680.80, 1,468,021.20 and 643,837.60

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Solution

The fourth proportional to 978,680.80, 1,468,021.20 and 643,837.60 is: 965,756.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,680.80 : 1,468,021.20 = 643,837.60 : x
  2. Step 2: Convert to fraction form
    978,680.80/1,468,021.20 = 643,837.60/x
  3. Step 3: Cross multiply
    978,680.80x = 1,468,021.20 × 643,837.60
  4. Step 4: Simplify right side
    978,680.80x = 945,167,246,157.12
  5. Step 5: Solve for x
    x = 945,167,246,157.12/978,680.80
  6. Step 6: Final answer
    x = 965,756.40

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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.