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Finding the Fourth Proportional to 953.64, 1,428.99 and 644.28

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Solution

The fourth proportional to 953.64, 1,428.99 and 644.28 is: 965.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.64 : 1,428.99 = 644.28 : x
  2. Step 2: Convert to fraction form
    953.64/1,428.99 = 644.28/x
  3. Step 3: Cross multiply
    953.64x = 1,428.99 × 644.28
  4. Step 4: Simplify right side
    953.64x = 920,669.68
  5. Step 5: Solve for x
    x = 920,669.68/953.64
  6. Step 6: Final answer
    x = 965.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.