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Finding the Fourth Proportional to 978,209.20, 1,370,426 and 978,209.20

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Solution

The fourth proportional to 978,209.20, 1,370,426 and 978,209.20 is: 1,370,426

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,209.20 : 1,370,426 = 978,209.20 : x
  2. Step 2: Convert to fraction form
    978,209.20/1,370,426 = 978,209.20/x
  3. Step 3: Cross multiply
    978,209.20x = 1,370,426 × 978,209.20
  4. Step 4: Simplify right side
    978,209.20x = 1,340,563,321,119.20
  5. Step 5: Solve for x
    x = 1,340,563,321,119.20/978,209.20
  6. Step 6: Final answer
    x = 1,370,426

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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.