Home / 1,428.98-2,143.53-455.15

Finding the Fourth Proportional to 1,428.98, 2,143.53 and 455.15

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Solution

The fourth proportional to 1,428.98, 2,143.53 and 455.15 is: 682.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.98 : 2,143.53 = 455.15 : x
  2. Step 2: Convert to fraction form
    1,428.98/2,143.53 = 455.15/x
  3. Step 3: Cross multiply
    1,428.98x = 2,143.53 × 455.15
  4. Step 4: Simplify right side
    1,428.98x = 975,616.96
  5. Step 5: Solve for x
    x = 975,616.96/1,428.98
  6. Step 6: Final answer
    x = 682.74

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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.