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Finding the Fourth Proportional to 938.66, 1,406.21 and 528.09

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Solution

The fourth proportional to 938.66, 1,406.21 and 528.09 is: 791.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.66 : 1,406.21 = 528.09 : x
  2. Step 2: Convert to fraction form
    938.66/1,406.21 = 528.09/x
  3. Step 3: Cross multiply
    938.66x = 1,406.21 × 528.09
  4. Step 4: Simplify right side
    938.66x = 742,605.44
  5. Step 5: Solve for x
    x = 742,605.44/938.66
  6. Step 6: Final answer
    x = 791.13

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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.