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Finding the Fourth Proportional to 683.30, 942.86 and 421.28

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Solution

The fourth proportional to 683.30, 942.86 and 421.28 is: 581.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.30 : 942.86 = 421.28 : x
  2. Step 2: Convert to fraction form
    683.30/942.86 = 421.28/x
  3. Step 3: Cross multiply
    683.30x = 942.86 × 421.28
  4. Step 4: Simplify right side
    683.30x = 397,208.06
  5. Step 5: Solve for x
    x = 397,208.06/683.30
  6. Step 6: Final answer
    x = 581.31

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1.5x scale

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.