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Finding the Fourth Proportional to 992.99, 1,369.98 and 619.67

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Solution

The fourth proportional to 992.99, 1,369.98 and 619.67 is: 854.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.99 : 1,369.98 = 619.67 : x
  2. Step 2: Convert to fraction form
    992.99/1,369.98 = 619.67/x
  3. Step 3: Cross multiply
    992.99x = 1,369.98 × 619.67
  4. Step 4: Simplify right side
    992.99x = 848,928.66
  5. Step 5: Solve for x
    x = 848,928.66/992.99
  6. Step 6: Final answer
    x = 854.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.