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Finding the Fourth Proportional to 783.93, 1,081.74 and 489.09

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Solution

The fourth proportional to 783.93, 1,081.74 and 489.09 is: 674.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.93 : 1,081.74 = 489.09 : x
  2. Step 2: Convert to fraction form
    783.93/1,081.74 = 489.09/x
  3. Step 3: Cross multiply
    783.93x = 1,081.74 × 489.09
  4. Step 4: Simplify right side
    783.93x = 529,068.22
  5. Step 5: Solve for x
    x = 529,068.22/783.93
  6. Step 6: Final answer
    x = 674.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.