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Finding the Fourth Proportional to 1,272.74, 1,910.93 and 784.31

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Solution

The fourth proportional to 1,272.74, 1,910.93 and 784.31 is: 1,177.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.74 : 1,910.93 = 784.31 : x
  2. Step 2: Convert to fraction form
    1,272.74/1,910.93 = 784.31/x
  3. Step 3: Cross multiply
    1,272.74x = 1,910.93 × 784.31
  4. Step 4: Simplify right side
    1,272.74x = 1,498,748.03
  5. Step 5: Solve for x
    x = 1,498,748.03/1,272.74
  6. Step 6: Final answer
    x = 1,177.58

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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.