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Finding the Fourth Proportional to 683.19, 1,024.79 and 317.78

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Solution

The fourth proportional to 683.19, 1,024.79 and 317.78 is: 476.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.19 : 1,024.79 = 317.78 : x
  2. Step 2: Convert to fraction form
    683.19/1,024.79 = 317.78/x
  3. Step 3: Cross multiply
    683.19x = 1,024.79 × 317.78
  4. Step 4: Simplify right side
    683.19x = 325,657.77
  5. Step 5: Solve for x
    x = 325,657.77/683.19
  6. Step 6: Final answer
    x = 476.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.