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Finding the Fourth Proportional to 528,858.20, 729,828.12 and 287,140.94

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Solution

The fourth proportional to 528,858.20, 729,828.12 and 287,140.94 is: 396,256.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,858.20 : 729,828.12 = 287,140.94 : x
  2. Step 2: Convert to fraction form
    528,858.20/729,828.12 = 287,140.94/x
  3. Step 3: Cross multiply
    528,858.20x = 729,828.12 × 287,140.94
  4. Step 4: Simplify right side
    528,858.20x = 209,563,528,766.09
  5. Step 5: Solve for x
    x = 209,563,528,766.09/528,858.20
  6. Step 6: Final answer
    x = 396,256.56

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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.