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Finding the Fourth Proportional to 683.42, 1,029.85 and 618.44

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Solution

The fourth proportional to 683.42, 1,029.85 and 618.44 is: 931.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.42 : 1,029.85 = 618.44 : x
  2. Step 2: Convert to fraction form
    683.42/1,029.85 = 618.44/x
  3. Step 3: Cross multiply
    683.42x = 1,029.85 × 618.44
  4. Step 4: Simplify right side
    683.42x = 636,893.74
  5. Step 5: Solve for x
    x = 636,893.74/683.42
  6. Step 6: Final answer
    x = 931.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.