Home / 85,860.30-129,136.05-76,874.70

Finding the Fourth Proportional to 85,860.30, 129,136.05 and 76,874.70

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Solution

The fourth proportional to 85,860.30, 129,136.05 and 76,874.70 is: 115,621.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,860.30 : 129,136.05 = 76,874.70 : x
  2. Step 2: Convert to fraction form
    85,860.30/129,136.05 = 76,874.70/x
  3. Step 3: Cross multiply
    85,860.30x = 129,136.05 × 76,874.70
  4. Step 4: Simplify right side
    85,860.30x = 9,927,295,102.94
  5. Step 5: Solve for x
    x = 9,927,295,102.94/85,860.30
  6. Step 6: Final answer
    x = 115,621.48

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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.