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Finding the Fourth Proportional to 528,679.34, 729,578.20 and 286,961.96

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Solution

The fourth proportional to 528,679.34, 729,578.20 and 286,961.96 is: 396,007.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,679.34 : 729,578.20 = 286,961.96 : x
  2. Step 2: Convert to fraction form
    528,679.34/729,578.20 = 286,961.96/x
  3. Step 3: Cross multiply
    528,679.34x = 729,578.20 × 286,961.96
  4. Step 4: Simplify right side
    528,679.34x = 209,361,190,245.27
  5. Step 5: Solve for x
    x = 209,361,190,245.27/528,679.34
  6. Step 6: Final answer
    x = 396,007.89

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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.