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Finding the Fourth Proportional to 1,038.38, 1,431.67 and 664.75

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Solution

The fourth proportional to 1,038.38, 1,431.67 and 664.75 is: 916.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.38 : 1,431.67 = 664.75 : x
  2. Step 2: Convert to fraction form
    1,038.38/1,431.67 = 664.75/x
  3. Step 3: Cross multiply
    1,038.38x = 1,431.67 × 664.75
  4. Step 4: Simplify right side
    1,038.38x = 951,692.15
  5. Step 5: Solve for x
    x = 951,692.15/1,038.38
  6. Step 6: Final answer
    x = 916.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.