Home / 1,428.08-2,142.16-698.28

Finding the Fourth Proportional to 1,428.08, 2,142.16 and 698.28

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Solution

The fourth proportional to 1,428.08, 2,142.16 and 698.28 is: 1,047.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.08 : 2,142.16 = 698.28 : x
  2. Step 2: Convert to fraction form
    1,428.08/2,142.16 = 698.28/x
  3. Step 3: Cross multiply
    1,428.08x = 2,142.16 × 698.28
  4. Step 4: Simplify right side
    1,428.08x = 1,495,827.48
  5. Step 5: Solve for x
    x = 1,495,827.48/1,428.08
  6. Step 6: Final answer
    x = 1,047.44

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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.