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Finding the Fourth Proportional to 970.28, 1,338.88 and 550.60

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Solution

The fourth proportional to 970.28, 1,338.88 and 550.60 is: 759.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.28 : 1,338.88 = 550.60 : x
  2. Step 2: Convert to fraction form
    970.28/1,338.88 = 550.60/x
  3. Step 3: Cross multiply
    970.28x = 1,338.88 × 550.60
  4. Step 4: Simplify right side
    970.28x = 737,187.33
  5. Step 5: Solve for x
    x = 737,187.33/970.28
  6. Step 6: Final answer
    x = 759.77

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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.