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Finding the Fourth Proportional to 1,271.34, 1,907.02 and 438.36

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Solution

The fourth proportional to 1,271.34, 1,907.02 and 438.36 is: 657.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.34 : 1,907.02 = 438.36 : x
  2. Step 2: Convert to fraction form
    1,271.34/1,907.02 = 438.36/x
  3. Step 3: Cross multiply
    1,271.34x = 1,907.02 × 438.36
  4. Step 4: Simplify right side
    1,271.34x = 835,961.29
  5. Step 5: Solve for x
    x = 835,961.29/1,271.34
  6. Step 6: Final answer
    x = 657.54

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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.