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Finding the Fourth Proportional to 990.82, 1,479.47 and 845.02

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Solution

The fourth proportional to 990.82, 1,479.47 and 845.02 is: 1,261.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.82 : 1,479.47 = 845.02 : x
  2. Step 2: Convert to fraction form
    990.82/1,479.47 = 845.02/x
  3. Step 3: Cross multiply
    990.82x = 1,479.47 × 845.02
  4. Step 4: Simplify right side
    990.82x = 1,250,181.74
  5. Step 5: Solve for x
    x = 1,250,181.74/990.82
  6. Step 6: Final answer
    x = 1,261.76

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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.