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Finding the Fourth Proportional to 826.29, 1,140.21 and 472.20

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Solution

The fourth proportional to 826.29, 1,140.21 and 472.20 is: 651.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.29 : 1,140.21 = 472.20 : x
  2. Step 2: Convert to fraction form
    826.29/1,140.21 = 472.20/x
  3. Step 3: Cross multiply
    826.29x = 1,140.21 × 472.20
  4. Step 4: Simplify right side
    826.29x = 538,407.16
  5. Step 5: Solve for x
    x = 538,407.16/826.29
  6. Step 6: Final answer
    x = 651.60

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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.