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Finding the Fourth Proportional to 683.47, 942.98 and 421.48

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Solution

The fourth proportional to 683.47, 942.98 and 421.48 is: 581.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.47 : 942.98 = 421.48 : x
  2. Step 2: Convert to fraction form
    683.47/942.98 = 421.48/x
  3. Step 3: Cross multiply
    683.47x = 942.98 × 421.48
  4. Step 4: Simplify right side
    683.47x = 397,447.21
  5. Step 5: Solve for x
    x = 397,447.21/683.47
  6. Step 6: Final answer
    x = 581.51

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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.