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Finding the Fourth Proportional to 690.96, 1,036.43 and 279.99

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Solution

The fourth proportional to 690.96, 1,036.43 and 279.99 is: 419.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.96 : 1,036.43 = 279.99 : x
  2. Step 2: Convert to fraction form
    690.96/1,036.43 = 279.99/x
  3. Step 3: Cross multiply
    690.96x = 1,036.43 × 279.99
  4. Step 4: Simplify right side
    690.96x = 290,189.69
  5. Step 5: Solve for x
    x = 290,189.69/690.96
  6. Step 6: Final answer
    x = 419.98

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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.