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Finding the Fourth Proportional to 938.18, 1,407.27 and 912.26

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Solution

The fourth proportional to 938.18, 1,407.27 and 912.26 is: 1,368.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.18 : 1,407.27 = 912.26 : x
  2. Step 2: Convert to fraction form
    938.18/1,407.27 = 912.26/x
  3. Step 3: Cross multiply
    938.18x = 1,407.27 × 912.26
  4. Step 4: Simplify right side
    938.18x = 1,283,789.09
  5. Step 5: Solve for x
    x = 1,283,789.09/938.18
  6. Step 6: Final answer
    x = 1,368.39

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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.