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Finding the Fourth Proportional to 103,690.35, 155,699.55 and 78,758.55

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Solution

The fourth proportional to 103,690.35, 155,699.55 and 78,758.55 is: 118,262.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,690.35 : 155,699.55 = 78,758.55 : x
  2. Step 2: Convert to fraction form
    103,690.35/155,699.55 = 78,758.55/x
  3. Step 3: Cross multiply
    103,690.35x = 155,699.55 × 78,758.55
  4. Step 4: Simplify right side
    103,690.35x = 12,262,670,793.65
  5. Step 5: Solve for x
    x = 12,262,670,793.65/103,690.35
  6. Step 6: Final answer
    x = 118,262.41

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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.