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Finding the Fourth Proportional to 2,108.66, 3,162.99 and 647.80

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Solution

The fourth proportional to 2,108.66, 3,162.99 and 647.80 is: 971.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.66 : 3,162.99 = 647.80 : x
  2. Step 2: Convert to fraction form
    2,108.66/3,162.99 = 647.80/x
  3. Step 3: Cross multiply
    2,108.66x = 3,162.99 × 647.80
  4. Step 4: Simplify right side
    2,108.66x = 2,048,975.80
  5. Step 5: Solve for x
    x = 2,048,975.80/2,108.66
  6. Step 6: Final answer
    x = 971.70

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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.