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Finding the Fourth Proportional to 12,539.52, 18,809.28 and 4,218

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Solution

The fourth proportional to 12,539.52, 18,809.28 and 4,218 is: 6,327.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,539.52 : 18,809.28 = 4,218 : x
  2. Step 2: Convert to fraction form
    12,539.52/18,809.28 = 4,218/x
  3. Step 3: Cross multiply
    12,539.52x = 18,809.28 × 4,218
  4. Step 4: Simplify right side
    12,539.52x = 79,337,543.04
  5. Step 5: Solve for x
    x = 79,337,543.04/12,539.52
  6. Step 6: Final answer
    x = 6,327.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.