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Finding the Fourth Proportional to 518,821.88, 778,469.28 and 266,279.72

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Solution

The fourth proportional to 518,821.88, 778,469.28 and 266,279.72 is: 399,540.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,821.88 : 778,469.28 = 266,279.72 : x
  2. Step 2: Convert to fraction form
    518,821.88/778,469.28 = 266,279.72/x
  3. Step 3: Cross multiply
    518,821.88x = 778,469.28 × 266,279.72
  4. Step 4: Simplify right side
    518,821.88x = 207,290,578,014.66
  5. Step 5: Solve for x
    x = 207,290,578,014.66/518,821.88
  6. Step 6: Final answer
    x = 399,540.93

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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.