Home / 1,420.38-2,131.38-986.22

Finding the Fourth Proportional to 1,420.38, 2,131.38 and 986.22

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Solution

The fourth proportional to 1,420.38, 2,131.38 and 986.22 is: 1,479.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.38 : 2,131.38 = 986.22 : x
  2. Step 2: Convert to fraction form
    1,420.38/2,131.38 = 986.22/x
  3. Step 3: Cross multiply
    1,420.38x = 2,131.38 × 986.22
  4. Step 4: Simplify right side
    1,420.38x = 2,102,009.58
  5. Step 5: Solve for x
    x = 2,102,009.58/1,420.38
  6. Step 6: Final answer
    x = 1,479.89

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1.5x scale

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.