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Finding the Fourth Proportional to 1,299.84, 1,949.78 and 992.25

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Solution

The fourth proportional to 1,299.84, 1,949.78 and 992.25 is: 1,488.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.84 : 1,949.78 = 992.25 : x
  2. Step 2: Convert to fraction form
    1,299.84/1,949.78 = 992.25/x
  3. Step 3: Cross multiply
    1,299.84x = 1,949.78 × 992.25
  4. Step 4: Simplify right side
    1,299.84x = 1,934,664.24
  5. Step 5: Solve for x
    x = 1,934,664.24/1,299.84
  6. Step 6: Final answer
    x = 1,488.39

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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.