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Finding the Fourth Proportional to 2,186.28, 3,279.40 and 647.28

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Solution

The fourth proportional to 2,186.28, 3,279.40 and 647.28 is: 970.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,186.28 : 3,279.40 = 647.28 : x
  2. Step 2: Convert to fraction form
    2,186.28/3,279.40 = 647.28/x
  3. Step 3: Cross multiply
    2,186.28x = 3,279.40 × 647.28
  4. Step 4: Simplify right side
    2,186.28x = 2,122,690.03
  5. Step 5: Solve for x
    x = 2,122,690.03/2,186.28
  6. Step 6: Final answer
    x = 970.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.