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Finding the Fourth Proportional to 938.90, 1,407.41 and 353.81

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Solution

The fourth proportional to 938.90, 1,407.41 and 353.81 is: 530.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.90 : 1,407.41 = 353.81 : x
  2. Step 2: Convert to fraction form
    938.90/1,407.41 = 353.81/x
  3. Step 3: Cross multiply
    938.90x = 1,407.41 × 353.81
  4. Step 4: Simplify right side
    938.90x = 497,953.96
  5. Step 5: Solve for x
    x = 497,953.96/938.90
  6. Step 6: Final answer
    x = 530.36

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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.