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Finding the Fourth Proportional to 990.62, 1,486.26 and 374.38

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Solution

The fourth proportional to 990.62, 1,486.26 and 374.38 is: 561.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.62 : 1,486.26 = 374.38 : x
  2. Step 2: Convert to fraction form
    990.62/1,486.26 = 374.38/x
  3. Step 3: Cross multiply
    990.62x = 1,486.26 × 374.38
  4. Step 4: Simplify right side
    990.62x = 556,422.30
  5. Step 5: Solve for x
    x = 556,422.30/990.62
  6. Step 6: Final answer
    x = 561.69

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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.