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Finding the Fourth Proportional to 826.61, 1,140.90 and 495.05

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Solution

The fourth proportional to 826.61, 1,140.90 and 495.05 is: 683.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.61 : 1,140.90 = 495.05 : x
  2. Step 2: Convert to fraction form
    826.61/1,140.90 = 495.05/x
  3. Step 3: Cross multiply
    826.61x = 1,140.90 × 495.05
  4. Step 4: Simplify right side
    826.61x = 564,802.55
  5. Step 5: Solve for x
    x = 564,802.55/826.61
  6. Step 6: Final answer
    x = 683.28

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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.