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Finding the Fourth Proportional to 1,037.78, 1,431.63 and 644.90

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Solution

The fourth proportional to 1,037.78, 1,431.63 and 644.90 is: 889.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.78 : 1,431.63 = 644.90 : x
  2. Step 2: Convert to fraction form
    1,037.78/1,431.63 = 644.90/x
  3. Step 3: Cross multiply
    1,037.78x = 1,431.63 × 644.90
  4. Step 4: Simplify right side
    1,037.78x = 923,258.19
  5. Step 5: Solve for x
    x = 923,258.19/1,037.78
  6. Step 6: Final answer
    x = 889.65

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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.