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Finding the Fourth Proportional to 1,037.52, 1,431.96 and 664.40

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Solution

The fourth proportional to 1,037.52, 1,431.96 and 664.40 is: 916.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.52 : 1,431.96 = 664.40 : x
  2. Step 2: Convert to fraction form
    1,037.52/1,431.96 = 664.40/x
  3. Step 3: Cross multiply
    1,037.52x = 1,431.96 × 664.40
  4. Step 4: Simplify right side
    1,037.52x = 951,394.22
  5. Step 5: Solve for x
    x = 951,394.22/1,037.52
  6. Step 6: Final answer
    x = 916.99

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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.