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Finding the Fourth Proportional to 85,615.88, 128,249.74 and 69,877

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Solution

The fourth proportional to 85,615.88, 128,249.74 and 69,877 is: 104,673.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,615.88 : 128,249.74 = 69,877 : x
  2. Step 2: Convert to fraction form
    85,615.88/128,249.74 = 69,877/x
  3. Step 3: Cross multiply
    85,615.88x = 128,249.74 × 69,877
  4. Step 4: Simplify right side
    85,615.88x = 8,961,707,081.98
  5. Step 5: Solve for x
    x = 8,961,707,081.98/85,615.88
  6. Step 6: Final answer
    x = 104,673.42

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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.