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Finding the Fourth Proportional to 1,274.73, 1,909.99 and 786.73

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Solution

The fourth proportional to 1,274.73, 1,909.99 and 786.73 is: 1,178.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.73 : 1,909.99 = 786.73 : x
  2. Step 2: Convert to fraction form
    1,274.73/1,909.99 = 786.73/x
  3. Step 3: Cross multiply
    1,274.73x = 1,909.99 × 786.73
  4. Step 4: Simplify right side
    1,274.73x = 1,502,646.43
  5. Step 5: Solve for x
    x = 1,502,646.43/1,274.73
  6. Step 6: Final answer
    x = 1,178.80

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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.