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Finding the Fourth Proportional to 980.90, 1,471.38 and 356.32

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Solution

The fourth proportional to 980.90, 1,471.38 and 356.32 is: 534.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.90 : 1,471.38 = 356.32 : x
  2. Step 2: Convert to fraction form
    980.90/1,471.38 = 356.32/x
  3. Step 3: Cross multiply
    980.90x = 1,471.38 × 356.32
  4. Step 4: Simplify right side
    980.90x = 524,282.12
  5. Step 5: Solve for x
    x = 524,282.12/980.90
  6. Step 6: Final answer
    x = 534.49

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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.