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Finding the Fourth Proportional to 652,168.20, 978,252.30 and 428,219.40

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Solution

The fourth proportional to 652,168.20, 978,252.30 and 428,219.40 is: 642,329.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,168.20 : 978,252.30 = 428,219.40 : x
  2. Step 2: Convert to fraction form
    652,168.20/978,252.30 = 428,219.40/x
  3. Step 3: Cross multiply
    652,168.20x = 978,252.30 × 428,219.40
  4. Step 4: Simplify right side
    652,168.20x = 418,906,612,954.62
  5. Step 5: Solve for x
    x = 418,906,612,954.62/652,168.20
  6. Step 6: Final answer
    x = 642,329.10

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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.