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Finding the Fourth Proportional to 826.36, 1,140.28 and 490.21

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Solution

The fourth proportional to 826.36, 1,140.28 and 490.21 is: 676.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.36 : 1,140.28 = 490.21 : x
  2. Step 2: Convert to fraction form
    826.36/1,140.28 = 490.21/x
  3. Step 3: Cross multiply
    826.36x = 1,140.28 × 490.21
  4. Step 4: Simplify right side
    826.36x = 558,968.51
  5. Step 5: Solve for x
    x = 558,968.51/826.36
  6. Step 6: Final answer
    x = 676.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.