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Finding the Fourth Proportional to 85,611.88, 128,243.74 and 69,873

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Solution

The fourth proportional to 85,611.88, 128,243.74 and 69,873 is: 104,667.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.88 : 128,243.74 = 69,873 : x
  2. Step 2: Convert to fraction form
    85,611.88/128,243.74 = 69,873/x
  3. Step 3: Cross multiply
    85,611.88x = 128,243.74 × 69,873
  4. Step 4: Simplify right side
    85,611.88x = 8,960,774,845.02
  5. Step 5: Solve for x
    x = 8,960,774,845.02/85,611.88
  6. Step 6: Final answer
    x = 104,667.42

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1.5x scale

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.