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Finding the Fourth Proportional to 978.99, 1,350.98 and 629.67

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Solution

The fourth proportional to 978.99, 1,350.98 and 629.67 is: 868.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.99 : 1,350.98 = 629.67 : x
  2. Step 2: Convert to fraction form
    978.99/1,350.98 = 629.67/x
  3. Step 3: Cross multiply
    978.99x = 1,350.98 × 629.67
  4. Step 4: Simplify right side
    978.99x = 850,675.86
  5. Step 5: Solve for x
    x = 850,675.86/978.99
  6. Step 6: Final answer
    x = 868.94

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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.