Home / 1,331.80-1,837.50-911.80

Finding the Fourth Proportional to 1,331.80, 1,837.50 and 911.80

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Solution

The fourth proportional to 1,331.80, 1,837.50 and 911.80 is: 1,258.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.80 : 1,837.50 = 911.80 : x
  2. Step 2: Convert to fraction form
    1,331.80/1,837.50 = 911.80/x
  3. Step 3: Cross multiply
    1,331.80x = 1,837.50 × 911.80
  4. Step 4: Simplify right side
    1,331.80x = 1,675,432.50
  5. Step 5: Solve for x
    x = 1,675,432.50/1,331.80
  6. Step 6: Final answer
    x = 1,258.02

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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.