Home / 1,428.74-2,143.35-455.14

Finding the Fourth Proportional to 1,428.74, 2,143.35 and 455.14

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Solution

The fourth proportional to 1,428.74, 2,143.35 and 455.14 is: 682.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.74 : 2,143.35 = 455.14 : x
  2. Step 2: Convert to fraction form
    1,428.74/2,143.35 = 455.14/x
  3. Step 3: Cross multiply
    1,428.74x = 2,143.35 × 455.14
  4. Step 4: Simplify right side
    1,428.74x = 975,524.32
  5. Step 5: Solve for x
    x = 975,524.32/1,428.74
  6. Step 6: Final answer
    x = 682.79

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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.