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Finding the Fourth Proportional to 1,271.45, 1,907.00 and 438.65

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Solution

The fourth proportional to 1,271.45, 1,907.00 and 438.65 is: 657.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.45 : 1,907.00 = 438.65 : x
  2. Step 2: Convert to fraction form
    1,271.45/1,907.00 = 438.65/x
  3. Step 3: Cross multiply
    1,271.45x = 1,907.00 × 438.65
  4. Step 4: Simplify right side
    1,271.45x = 836,493.82
  5. Step 5: Solve for x
    x = 836,493.82/1,271.45
  6. Step 6: Final answer
    x = 657.90

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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.