Home / 85,617.38-128,251.99-69,878.50

Finding the Fourth Proportional to 85,617.38, 128,251.99 and 69,878.50

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Solution

The fourth proportional to 85,617.38, 128,251.99 and 69,878.50 is: 104,675.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,617.38 : 128,251.99 = 69,878.50 : x
  2. Step 2: Convert to fraction form
    85,617.38/128,251.99 = 69,878.50/x
  3. Step 3: Cross multiply
    85,617.38x = 128,251.99 × 69,878.50
  4. Step 4: Simplify right side
    85,617.38x = 8,962,056,683.22
  5. Step 5: Solve for x
    x = 8,962,056,683.22/85,617.38
  6. Step 6: Final answer
    x = 104,675.67

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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.