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Finding the Fourth Proportional to 990.16, 1,478.79 and 842.33

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Solution

The fourth proportional to 990.16, 1,478.79 and 842.33 is: 1,258.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.16 : 1,478.79 = 842.33 : x
  2. Step 2: Convert to fraction form
    990.16/1,478.79 = 842.33/x
  3. Step 3: Cross multiply
    990.16x = 1,478.79 × 842.33
  4. Step 4: Simplify right side
    990.16x = 1,245,632.88
  5. Step 5: Solve for x
    x = 1,245,632.88/990.16
  6. Step 6: Final answer
    x = 1,258.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.