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Finding the Fourth Proportional to 825.78, 1,139.55 and 476.52

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Solution

The fourth proportional to 825.78, 1,139.55 and 476.52 is: 657.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.78 : 1,139.55 = 476.52 : x
  2. Step 2: Convert to fraction form
    825.78/1,139.55 = 476.52/x
  3. Step 3: Cross multiply
    825.78x = 1,139.55 × 476.52
  4. Step 4: Simplify right side
    825.78x = 543,018.37
  5. Step 5: Solve for x
    x = 543,018.37/825.78
  6. Step 6: Final answer
    x = 657.58

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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.