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Finding the Fourth Proportional to 1,272.14, 1,907.61 and 745.20

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Solution

The fourth proportional to 1,272.14, 1,907.61 and 745.20 is: 1,117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.14 : 1,907.61 = 745.20 : x
  2. Step 2: Convert to fraction form
    1,272.14/1,907.61 = 745.20/x
  3. Step 3: Cross multiply
    1,272.14x = 1,907.61 × 745.20
  4. Step 4: Simplify right side
    1,272.14x = 1,421,550.97
  5. Step 5: Solve for x
    x = 1,421,550.97/1,272.14
  6. Step 6: Final answer
    x = 1,117.45

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1.5x scale

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.