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Finding the Fourth Proportional to 664,505.78, 996,856.49 and 215,077.28

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Solution

The fourth proportional to 664,505.78, 996,856.49 and 215,077.28 is: 322,647.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,505.78 : 996,856.49 = 215,077.28 : x
  2. Step 2: Convert to fraction form
    664,505.78/996,856.49 = 215,077.28/x
  3. Step 3: Cross multiply
    664,505.78x = 996,856.49 × 215,077.28
  4. Step 4: Simplify right side
    664,505.78x = 214,401,182,419.55
  5. Step 5: Solve for x
    x = 214,401,182,419.55/664,505.78
  6. Step 6: Final answer
    x = 322,647.58

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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.