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Finding the Fourth Proportional to 78,830.20, 118,245.30 and 72,868.60

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Solution

The fourth proportional to 78,830.20, 118,245.30 and 72,868.60 is: 109,302.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,830.20 : 118,245.30 = 72,868.60 : x
  2. Step 2: Convert to fraction form
    78,830.20/118,245.30 = 72,868.60/x
  3. Step 3: Cross multiply
    78,830.20x = 118,245.30 × 72,868.60
  4. Step 4: Simplify right side
    78,830.20x = 8,616,369,467.58
  5. Step 5: Solve for x
    x = 8,616,369,467.58/78,830.20
  6. Step 6: Final answer
    x = 109,302.90

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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.