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Finding the Fourth Proportional to 974.84, 1,344.89 and 620.67

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Solution

The fourth proportional to 974.84, 1,344.89 and 620.67 is: 856.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.84 : 1,344.89 = 620.67 : x
  2. Step 2: Convert to fraction form
    974.84/1,344.89 = 620.67/x
  3. Step 3: Cross multiply
    974.84x = 1,344.89 × 620.67
  4. Step 4: Simplify right side
    974.84x = 834,732.88
  5. Step 5: Solve for x
    x = 834,732.88/974.84
  6. Step 6: Final answer
    x = 856.28

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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.