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Finding the Fourth Proportional to 978,658,516.20, 1,467,987,774.30 and 396,671,572.20

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Solution

The fourth proportional to 978,658,516.20, 1,467,987,774.30 and 396,671,572.20 is: 595,007,358.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,658,516.20 : 1,467,987,774.30 = 396,671,572.20 : x
  2. Step 2: Convert to fraction form
    978,658,516.20/1,467,987,774.30 = 396,671,572.20/x
  3. Step 3: Cross multiply
    978,658,516.20x = 1,467,987,774.30 × 396,671,572.20
  4. Step 4: Simplify right side
    978,658,516.20x = 582,309,018,401,959,680
  5. Step 5: Solve for x
    x = 582,309,018,401,959,680/978,658,516.20
  6. Step 6: Final answer
    x = 595,007,358.30

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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.