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Finding the Fourth Proportional to 941.21, 1,412.30 and 421.56

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Solution

The fourth proportional to 941.21, 1,412.30 and 421.56 is: 632.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.21 : 1,412.30 = 421.56 : x
  2. Step 2: Convert to fraction form
    941.21/1,412.30 = 421.56/x
  3. Step 3: Cross multiply
    941.21x = 1,412.30 × 421.56
  4. Step 4: Simplify right side
    941.21x = 595,367.08
  5. Step 5: Solve for x
    x = 595,367.08/941.21
  6. Step 6: Final answer
    x = 632.56

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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.