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Finding the Fourth Proportional to 689.50, 950.70 and 492.67

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Solution

The fourth proportional to 689.50, 950.70 and 492.67 is: 679.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.50 : 950.70 = 492.67 : x
  2. Step 2: Convert to fraction form
    689.50/950.70 = 492.67/x
  3. Step 3: Cross multiply
    689.50x = 950.70 × 492.67
  4. Step 4: Simplify right side
    689.50x = 468,381.37
  5. Step 5: Solve for x
    x = 468,381.37/689.50
  6. Step 6: Final answer
    x = 679.31

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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.