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Finding the Fourth Proportional to 627.48, 939.80 and 421.46

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Solution

The fourth proportional to 627.48, 939.80 and 421.46 is: 631.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.48 : 939.80 = 421.46 : x
  2. Step 2: Convert to fraction form
    627.48/939.80 = 421.46/x
  3. Step 3: Cross multiply
    627.48x = 939.80 × 421.46
  4. Step 4: Simplify right side
    627.48x = 396,090.63
  5. Step 5: Solve for x
    x = 396,090.63/627.48
  6. Step 6: Final answer
    x = 631.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.