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Finding the Fourth Proportional to 528,874.69, 729,861.85 and 287,172

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Solution

The fourth proportional to 528,874.69, 729,861.85 and 287,172 is: 396,305.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,874.69 : 729,861.85 = 287,172 : x
  2. Step 2: Convert to fraction form
    528,874.69/729,861.85 = 287,172/x
  3. Step 3: Cross multiply
    528,874.69x = 729,861.85 × 287,172
  4. Step 4: Simplify right side
    528,874.69x = 209,595,887,188.20
  5. Step 5: Solve for x
    x = 209,595,887,188.20/528,874.69
  6. Step 6: Final answer
    x = 396,305.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.