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Finding the Fourth Proportional to 980.49, 1,349.68 and 847.65

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Solution

The fourth proportional to 980.49, 1,349.68 and 847.65 is: 1,166.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.49 : 1,349.68 = 847.65 : x
  2. Step 2: Convert to fraction form
    980.49/1,349.68 = 847.65/x
  3. Step 3: Cross multiply
    980.49x = 1,349.68 × 847.65
  4. Step 4: Simplify right side
    980.49x = 1,144,056.25
  5. Step 5: Solve for x
    x = 1,144,056.25/980.49
  6. Step 6: Final answer
    x = 1,166.82

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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.