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Finding the Fourth Proportional to 1,037.10, 1,431.90 and 644.70

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Solution

The fourth proportional to 1,037.10, 1,431.90 and 644.70 is: 890.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.10 : 1,431.90 = 644.70 : x
  2. Step 2: Convert to fraction form
    1,037.10/1,431.90 = 644.70/x
  3. Step 3: Cross multiply
    1,037.10x = 1,431.90 × 644.70
  4. Step 4: Simplify right side
    1,037.10x = 923,145.93
  5. Step 5: Solve for x
    x = 923,145.93/1,037.10
  6. Step 6: Final answer
    x = 890.12

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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.