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Finding the Fourth Proportional to 990.74, 1,486.92 and 414.02

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Solution

The fourth proportional to 990.74, 1,486.92 and 414.02 is: 621.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.74 : 1,486.92 = 414.02 : x
  2. Step 2: Convert to fraction form
    990.74/1,486.92 = 414.02/x
  3. Step 3: Cross multiply
    990.74x = 1,486.92 × 414.02
  4. Step 4: Simplify right side
    990.74x = 615,614.62
  5. Step 5: Solve for x
    x = 615,614.62/990.74
  6. Step 6: Final answer
    x = 621.37

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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.