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Finding the Fourth Proportional to 980.21, 1,470.33 and 330.98

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Solution

The fourth proportional to 980.21, 1,470.33 and 330.98 is: 496.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.21 : 1,470.33 = 330.98 : x
  2. Step 2: Convert to fraction form
    980.21/1,470.33 = 330.98/x
  3. Step 3: Cross multiply
    980.21x = 1,470.33 × 330.98
  4. Step 4: Simplify right side
    980.21x = 486,649.82
  5. Step 5: Solve for x
    x = 486,649.82/980.21
  6. Step 6: Final answer
    x = 496.48

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1.5x scale

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.