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Finding the Fourth Proportional to 990.69, 1,486.03 and 374.28

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Solution

The fourth proportional to 990.69, 1,486.03 and 374.28 is: 561.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.69 : 1,486.03 = 374.28 : x
  2. Step 2: Convert to fraction form
    990.69/1,486.03 = 374.28/x
  3. Step 3: Cross multiply
    990.69x = 1,486.03 × 374.28
  4. Step 4: Simplify right side
    990.69x = 556,191.31
  5. Step 5: Solve for x
    x = 556,191.31/990.69
  6. Step 6: Final answer
    x = 561.42

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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.