Home / 1,427.12-2,140.64-657.62

Finding the Fourth Proportional to 1,427.12, 2,140.64 and 657.62

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Solution

The fourth proportional to 1,427.12, 2,140.64 and 657.62 is: 986.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.12 : 2,140.64 = 657.62 : x
  2. Step 2: Convert to fraction form
    1,427.12/2,140.64 = 657.62/x
  3. Step 3: Cross multiply
    1,427.12x = 2,140.64 × 657.62
  4. Step 4: Simplify right side
    1,427.12x = 1,407,716.97
  5. Step 5: Solve for x
    x = 1,407,716.97/1,427.12
  6. Step 6: Final answer
    x = 986.41

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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.