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Finding the Fourth Proportional to 103,699.85, 155,713.80 and 78,768.05

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Solution

The fourth proportional to 103,699.85, 155,713.80 and 78,768.05 is: 118,276.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,699.85 : 155,713.80 = 78,768.05 : x
  2. Step 2: Convert to fraction form
    103,699.85/155,713.80 = 78,768.05/x
  3. Step 3: Cross multiply
    103,699.85x = 155,713.80 × 78,768.05
  4. Step 4: Simplify right side
    103,699.85x = 12,265,272,384.09
  5. Step 5: Solve for x
    x = 12,265,272,384.09/103,699.85
  6. Step 6: Final answer
    x = 118,276.66

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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.