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Finding the Fourth Proportional to 938.55, 1,407.82 and 289.29

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Solution

The fourth proportional to 938.55, 1,407.82 and 289.29 is: 433.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.55 : 1,407.82 = 289.29 : x
  2. Step 2: Convert to fraction form
    938.55/1,407.82 = 289.29/x
  3. Step 3: Cross multiply
    938.55x = 1,407.82 × 289.29
  4. Step 4: Simplify right side
    938.55x = 407,268.25
  5. Step 5: Solve for x
    x = 407,268.25/938.55
  6. Step 6: Final answer
    x = 433.93

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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.