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Finding the Fourth Proportional to 1,247.21, 1,870.37 and 369.48

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Solution

The fourth proportional to 1,247.21, 1,870.37 and 369.48 is: 554.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.21 : 1,870.37 = 369.48 : x
  2. Step 2: Convert to fraction form
    1,247.21/1,870.37 = 369.48/x
  3. Step 3: Cross multiply
    1,247.21x = 1,870.37 × 369.48
  4. Step 4: Simplify right side
    1,247.21x = 691,062.46
  5. Step 5: Solve for x
    x = 691,062.46/1,247.21
  6. Step 6: Final answer
    x = 554.09

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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.