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Finding the Fourth Proportional to 978,069.20, 1,367,638 and 978,069.20

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Solution

The fourth proportional to 978,069.20, 1,367,638 and 978,069.20 is: 1,367,638

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,069.20 : 1,367,638 = 978,069.20 : x
  2. Step 2: Convert to fraction form
    978,069.20/1,367,638 = 978,069.20/x
  3. Step 3: Cross multiply
    978,069.20x = 1,367,638 × 978,069.20
  4. Step 4: Simplify right side
    978,069.20x = 1,337,644,604,549.60
  5. Step 5: Solve for x
    x = 1,337,644,604,549.60/978,069.20
  6. Step 6: Final answer
    x = 1,367,638

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.