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Finding the Fourth Proportional to 219,411.90, 328,920.84 and 79,137.72

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Solution

The fourth proportional to 219,411.90, 328,920.84 and 79,137.72 is: 118,635.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,411.90 : 328,920.84 = 79,137.72 : x
  2. Step 2: Convert to fraction form
    219,411.90/328,920.84 = 79,137.72/x
  3. Step 3: Cross multiply
    219,411.90x = 328,920.84 × 79,137.72
  4. Step 4: Simplify right side
    219,411.90x = 26,030,045,338.08
  5. Step 5: Solve for x
    x = 26,030,045,338.08/219,411.90
  6. Step 6: Final answer
    x = 118,635.52

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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.