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Finding the Fourth Proportional to 683.46, 942.71 and 421.02

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Solution

The fourth proportional to 683.46, 942.71 and 421.02 is: 580.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.46 : 942.71 = 421.02 : x
  2. Step 2: Convert to fraction form
    683.46/942.71 = 421.02/x
  3. Step 3: Cross multiply
    683.46x = 942.71 × 421.02
  4. Step 4: Simplify right side
    683.46x = 396,897.66
  5. Step 5: Solve for x
    x = 396,897.66/683.46
  6. Step 6: Final answer
    x = 580.72

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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.