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Finding the Fourth Proportional to 393,038.78, 542,363.67 and 220,929.37

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Solution

The fourth proportional to 393,038.78, 542,363.67 and 220,929.37 is: 304,865.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,038.78 : 542,363.67 = 220,929.37 : x
  2. Step 2: Convert to fraction form
    393,038.78/542,363.67 = 220,929.37/x
  3. Step 3: Cross multiply
    393,038.78x = 542,363.67 × 220,929.37
  4. Step 4: Simplify right side
    393,038.78x = 119,824,062,568.08
  5. Step 5: Solve for x
    x = 119,824,062,568.08/393,038.78
  6. Step 6: Final answer
    x = 304,865.75

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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.