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Finding the Fourth Proportional to 980.51, 1,470.96 and 395.69

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Solution

The fourth proportional to 980.51, 1,470.96 and 395.69 is: 593.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.51 : 1,470.96 = 395.69 : x
  2. Step 2: Convert to fraction form
    980.51/1,470.96 = 395.69/x
  3. Step 3: Cross multiply
    980.51x = 1,470.96 × 395.69
  4. Step 4: Simplify right side
    980.51x = 582,036.81
  5. Step 5: Solve for x
    x = 582,036.81/980.51
  6. Step 6: Final answer
    x = 593.61

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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.