Home / 85,869.96-128,783.94-67,103.46

Finding the Fourth Proportional to 85,869.96, 128,783.94 and 67,103.46

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Solution

The fourth proportional to 85,869.96, 128,783.94 and 67,103.46 is: 100,638.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,869.96 : 128,783.94 = 67,103.46 : x
  2. Step 2: Convert to fraction form
    85,869.96/128,783.94 = 67,103.46/x
  3. Step 3: Cross multiply
    85,869.96x = 128,783.94 × 67,103.46
  4. Step 4: Simplify right side
    85,869.96x = 8,641,847,966.43
  5. Step 5: Solve for x
    x = 8,641,847,966.43/85,869.96
  6. Step 6: Final answer
    x = 100,638.78

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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.