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Finding the Fourth Proportional to 528,879.61, 729,866.55 and 287,172.37

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Solution

The fourth proportional to 528,879.61, 729,866.55 and 287,172.37 is: 396,304.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,879.61 : 729,866.55 = 287,172.37 : x
  2. Step 2: Convert to fraction form
    528,879.61/729,866.55 = 287,172.37/x
  3. Step 3: Cross multiply
    528,879.61x = 729,866.55 × 287,172.37
  4. Step 4: Simplify right side
    528,879.61x = 209,597,507,321.11
  5. Step 5: Solve for x
    x = 209,597,507,321.11/528,879.61
  6. Step 6: Final answer
    x = 396,304.76

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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.