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Finding the Fourth Proportional to 683.16, 942.78 and 421.26

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Solution

The fourth proportional to 683.16, 942.78 and 421.26 is: 581.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.16 : 942.78 = 421.26 : x
  2. Step 2: Convert to fraction form
    683.16/942.78 = 421.26/x
  3. Step 3: Cross multiply
    683.16x = 942.78 × 421.26
  4. Step 4: Simplify right side
    683.16x = 397,155.50
  5. Step 5: Solve for x
    x = 397,155.50/683.16
  6. Step 6: Final answer
    x = 581.35

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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.