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Finding the Fourth Proportional to 826.78, 1,140.89 and 495.08

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Solution

The fourth proportional to 826.78, 1,140.89 and 495.08 is: 683.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.78 : 1,140.89 = 495.08 : x
  2. Step 2: Convert to fraction form
    826.78/1,140.89 = 495.08/x
  3. Step 3: Cross multiply
    826.78x = 1,140.89 × 495.08
  4. Step 4: Simplify right side
    826.78x = 564,831.82
  5. Step 5: Solve for x
    x = 564,831.82/826.78
  6. Step 6: Final answer
    x = 683.17

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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.