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Finding the Fourth Proportional to 780.98, 1,171.33 and 451.71

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Solution

The fourth proportional to 780.98, 1,171.33 and 451.71 is: 677.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.98 : 1,171.33 = 451.71 : x
  2. Step 2: Convert to fraction form
    780.98/1,171.33 = 451.71/x
  3. Step 3: Cross multiply
    780.98x = 1,171.33 × 451.71
  4. Step 4: Simplify right side
    780.98x = 529,100.35
  5. Step 5: Solve for x
    x = 529,100.35/780.98
  6. Step 6: Final answer
    x = 677.49

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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.