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Finding the Fourth Proportional to 1,272.23, 1,907.04 and 860.39

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Solution

The fourth proportional to 1,272.23, 1,907.04 and 860.39 is: 1,289.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.23 : 1,907.04 = 860.39 : x
  2. Step 2: Convert to fraction form
    1,272.23/1,907.04 = 860.39/x
  3. Step 3: Cross multiply
    1,272.23x = 1,907.04 × 860.39
  4. Step 4: Simplify right side
    1,272.23x = 1,640,788.61
  5. Step 5: Solve for x
    x = 1,640,788.61/1,272.23
  6. Step 6: Final answer
    x = 1,289.70

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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.