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Finding the Fourth Proportional to 2,108.06, 3,162.10 and 647.20

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Solution

The fourth proportional to 2,108.06, 3,162.10 and 647.20 is: 970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.06 : 3,162.10 = 647.20 : x
  2. Step 2: Convert to fraction form
    2,108.06/3,162.10 = 647.20/x
  3. Step 3: Cross multiply
    2,108.06x = 3,162.10 × 647.20
  4. Step 4: Simplify right side
    2,108.06x = 2,046,511.12
  5. Step 5: Solve for x
    x = 2,046,511.12/2,108.06
  6. Step 6: Final answer
    x = 970.80

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Similar ratio
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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.