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Finding the Fourth Proportional to 997.95, 1,491.11 and 877.67

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Solution

The fourth proportional to 997.95, 1,491.11 and 877.67 is: 1,311.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.95 : 1,491.11 = 877.67 : x
  2. Step 2: Convert to fraction form
    997.95/1,491.11 = 877.67/x
  3. Step 3: Cross multiply
    997.95x = 1,491.11 × 877.67
  4. Step 4: Simplify right side
    997.95x = 1,308,690.67
  5. Step 5: Solve for x
    x = 1,308,690.67/997.95
  6. Step 6: Final answer
    x = 1,311.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.