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Finding the Fourth Proportional to 1,290.65, 1,936.07 and 468.92

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Solution

The fourth proportional to 1,290.65, 1,936.07 and 468.92 is: 703.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.65 : 1,936.07 = 468.92 : x
  2. Step 2: Convert to fraction form
    1,290.65/1,936.07 = 468.92/x
  3. Step 3: Cross multiply
    1,290.65x = 1,936.07 × 468.92
  4. Step 4: Simplify right side
    1,290.65x = 907,861.94
  5. Step 5: Solve for x
    x = 907,861.94/1,290.65
  6. Step 6: Final answer
    x = 703.41

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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.