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Finding the Fourth Proportional to 1,037.20, 1,431.58 and 644.52

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Solution

The fourth proportional to 1,037.20, 1,431.58 and 644.52 is: 889.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.20 : 1,431.58 = 644.52 : x
  2. Step 2: Convert to fraction form
    1,037.20/1,431.58 = 644.52/x
  3. Step 3: Cross multiply
    1,037.20x = 1,431.58 × 644.52
  4. Step 4: Simplify right side
    1,037.20x = 922,681.94
  5. Step 5: Solve for x
    x = 922,681.94/1,037.20
  6. Step 6: Final answer
    x = 889.59

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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.