Home / 1,388.18-2,081.90-414.06

Finding the Fourth Proportional to 1,388.18, 2,081.90 and 414.06

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Solution

The fourth proportional to 1,388.18, 2,081.90 and 414.06 is: 620.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.18 : 2,081.90 = 414.06 : x
  2. Step 2: Convert to fraction form
    1,388.18/2,081.90 = 414.06/x
  3. Step 3: Cross multiply
    1,388.18x = 2,081.90 × 414.06
  4. Step 4: Simplify right side
    1,388.18x = 862,031.51
  5. Step 5: Solve for x
    x = 862,031.51/1,388.18
  6. Step 6: Final answer
    x = 620.98

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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.