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Finding the Fourth Proportional to 78,930.40, 118,401.80 and 26,339.88

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Solution

The fourth proportional to 78,930.40, 118,401.80 and 26,339.88 is: 39,511.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,930.40 : 118,401.80 = 26,339.88 : x
  2. Step 2: Convert to fraction form
    78,930.40/118,401.80 = 26,339.88/x
  3. Step 3: Cross multiply
    78,930.40x = 118,401.80 × 26,339.88
  4. Step 4: Simplify right side
    78,930.40x = 3,118,689,203.78
  5. Step 5: Solve for x
    x = 3,118,689,203.78/78,930.40
  6. Step 6: Final answer
    x = 39,511.89

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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.