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Finding the Fourth Proportional to 1,908.50, 2,863.70 and 813.12

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Solution

The fourth proportional to 1,908.50, 2,863.70 and 813.12 is: 1,220.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,908.50 : 2,863.70 = 813.12 : x
  2. Step 2: Convert to fraction form
    1,908.50/2,863.70 = 813.12/x
  3. Step 3: Cross multiply
    1,908.50x = 2,863.70 × 813.12
  4. Step 4: Simplify right side
    1,908.50x = 2,328,531.74
  5. Step 5: Solve for x
    x = 2,328,531.74/1,908.50
  6. Step 6: Final answer
    x = 1,220.08

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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.