Home / 1,389.38-1,916.99-850.86

Finding the Fourth Proportional to 1,389.38, 1,916.99 and 850.86

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Solution

The fourth proportional to 1,389.38, 1,916.99 and 850.86 is: 1,173.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.38 : 1,916.99 = 850.86 : x
  2. Step 2: Convert to fraction form
    1,389.38/1,916.99 = 850.86/x
  3. Step 3: Cross multiply
    1,389.38x = 1,916.99 × 850.86
  4. Step 4: Simplify right side
    1,389.38x = 1,631,090.11
  5. Step 5: Solve for x
    x = 1,631,090.11/1,389.38
  6. Step 6: Final answer
    x = 1,173.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.