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Finding the Fourth Proportional to 518,520.89, 778,021.91 and 219,071.39

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Solution

The fourth proportional to 518,520.89, 778,021.91 and 219,071.39 is: 328,708.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,520.89 : 778,021.91 = 219,071.39 : x
  2. Step 2: Convert to fraction form
    518,520.89/778,021.91 = 219,071.39/x
  3. Step 3: Cross multiply
    518,520.89x = 778,021.91 × 219,071.39
  4. Step 4: Simplify right side
    518,520.89x = 170,442,337,110.21
  5. Step 5: Solve for x
    x = 170,442,337,110.21/518,520.89
  6. Step 6: Final answer
    x = 328,708.72

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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.