Home / 1,420.94-2,126.87-761.18

Finding the Fourth Proportional to 1,420.94, 2,126.87 and 761.18

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Solution

The fourth proportional to 1,420.94, 2,126.87 and 761.18 is: 1,139.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.94 : 2,126.87 = 761.18 : x
  2. Step 2: Convert to fraction form
    1,420.94/2,126.87 = 761.18/x
  3. Step 3: Cross multiply
    1,420.94x = 2,126.87 × 761.18
  4. Step 4: Simplify right side
    1,420.94x = 1,618,919.32
  5. Step 5: Solve for x
    x = 1,618,919.32/1,420.94
  6. Step 6: Final answer
    x = 1,139.33

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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.