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Finding the Fourth Proportional to 1,290.80, 1,935.81 and 366.43

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Solution

The fourth proportional to 1,290.80, 1,935.81 and 366.43 is: 549.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.80 : 1,935.81 = 366.43 : x
  2. Step 2: Convert to fraction form
    1,290.80/1,935.81 = 366.43/x
  3. Step 3: Cross multiply
    1,290.80x = 1,935.81 × 366.43
  4. Step 4: Simplify right side
    1,290.80x = 709,337.03
  5. Step 5: Solve for x
    x = 709,337.03/1,290.80
  6. Step 6: Final answer
    x = 549.53

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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.