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Finding the Fourth Proportional to 1,290.78, 1,936.28 and 366.35

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Solution

The fourth proportional to 1,290.78, 1,936.28 and 366.35 is: 549.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.78 : 1,936.28 = 366.35 : x
  2. Step 2: Convert to fraction form
    1,290.78/1,936.28 = 366.35/x
  3. Step 3: Cross multiply
    1,290.78x = 1,936.28 × 366.35
  4. Step 4: Simplify right side
    1,290.78x = 709,344.66
  5. Step 5: Solve for x
    x = 709,344.66/1,290.78
  6. Step 6: Final answer
    x = 549.55

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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.