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Finding the Fourth Proportional to 78,087.90, 107,942.90 and 69,673.43

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Solution

The fourth proportional to 78,087.90, 107,942.90 and 69,673.43 is: 96,311.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,087.90 : 107,942.90 = 69,673.43 : x
  2. Step 2: Convert to fraction form
    78,087.90/107,942.90 = 69,673.43/x
  3. Step 3: Cross multiply
    78,087.90x = 107,942.90 × 69,673.43
  4. Step 4: Simplify right side
    78,087.90x = 7,520,751,199.07
  5. Step 5: Solve for x
    x = 7,520,751,199.07/78,087.90
  6. Step 6: Final answer
    x = 96,311.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.