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Finding the Fourth Proportional to 1,647.78, 2,274.39 and 985.08

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Solution

The fourth proportional to 1,647.78, 2,274.39 and 985.08 is: 1,359.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.78 : 2,274.39 = 985.08 : x
  2. Step 2: Convert to fraction form
    1,647.78/2,274.39 = 985.08/x
  3. Step 3: Cross multiply
    1,647.78x = 2,274.39 × 985.08
  4. Step 4: Simplify right side
    1,647.78x = 2,240,456.10
  5. Step 5: Solve for x
    x = 2,240,456.10/1,647.78
  6. Step 6: Final answer
    x = 1,359.68

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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.