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Finding the Fourth Proportional to 1,037.40, 1,431.24 and 664.34

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Solution

The fourth proportional to 1,037.40, 1,431.24 and 664.34 is: 916.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.40 : 1,431.24 = 664.34 : x
  2. Step 2: Convert to fraction form
    1,037.40/1,431.24 = 664.34/x
  3. Step 3: Cross multiply
    1,037.40x = 1,431.24 × 664.34
  4. Step 4: Simplify right side
    1,037.40x = 950,829.98
  5. Step 5: Solve for x
    x = 950,829.98/1,037.40
  6. Step 6: Final answer
    x = 916.55

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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.