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Finding the Fourth Proportional to 980.60, 1,470.66 and 355.80

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Solution

The fourth proportional to 980.60, 1,470.66 and 355.80 is: 533.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.60 : 1,470.66 = 355.80 : x
  2. Step 2: Convert to fraction form
    980.60/1,470.66 = 355.80/x
  3. Step 3: Cross multiply
    980.60x = 1,470.66 × 355.80
  4. Step 4: Simplify right side
    980.60x = 523,260.83
  5. Step 5: Solve for x
    x = 523,260.83/980.60
  6. Step 6: Final answer
    x = 533.61

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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.