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Finding the Fourth Proportional to 942.01, 1,412.78 and 421.72

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Solution

The fourth proportional to 942.01, 1,412.78 and 421.72 is: 632.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.01 : 1,412.78 = 421.72 : x
  2. Step 2: Convert to fraction form
    942.01/1,412.78 = 421.72/x
  3. Step 3: Cross multiply
    942.01x = 1,412.78 × 421.72
  4. Step 4: Simplify right side
    942.01x = 595,791.94
  5. Step 5: Solve for x
    x = 595,791.94/942.01
  6. Step 6: Final answer
    x = 632.47

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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.