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Finding the Fourth Proportional to 1,272.51, 1,909.64 and 622.89

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Solution

The fourth proportional to 1,272.51, 1,909.64 and 622.89 is: 934.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.51 : 1,909.64 = 622.89 : x
  2. Step 2: Convert to fraction form
    1,272.51/1,909.64 = 622.89/x
  3. Step 3: Cross multiply
    1,272.51x = 1,909.64 × 622.89
  4. Step 4: Simplify right side
    1,272.51x = 1,189,497.22
  5. Step 5: Solve for x
    x = 1,189,497.22/1,272.51
  6. Step 6: Final answer
    x = 934.76

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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.