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Finding the Fourth Proportional to 989.69, 1,367.28 and 657.99

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Solution

The fourth proportional to 989.69, 1,367.28 and 657.99 is: 909.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.69 : 1,367.28 = 657.99 : x
  2. Step 2: Convert to fraction form
    989.69/1,367.28 = 657.99/x
  3. Step 3: Cross multiply
    989.69x = 1,367.28 × 657.99
  4. Step 4: Simplify right side
    989.69x = 899,656.57
  5. Step 5: Solve for x
    x = 899,656.57/989.69
  6. Step 6: Final answer
    x = 909.03

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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.