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Finding the Fourth Proportional to 2,990.28, 4,485.38 and 910.28

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Solution

The fourth proportional to 2,990.28, 4,485.38 and 910.28 is: 1,365.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.28 : 4,485.38 = 910.28 : x
  2. Step 2: Convert to fraction form
    2,990.28/4,485.38 = 910.28/x
  3. Step 3: Cross multiply
    2,990.28x = 4,485.38 × 910.28
  4. Step 4: Simplify right side
    2,990.28x = 4,082,951.71
  5. Step 5: Solve for x
    x = 4,082,951.71/2,990.28
  6. Step 6: Final answer
    x = 1,365.41

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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.