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Finding the Fourth Proportional to 953.07, 1,428.89 and 644.05

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Solution

The fourth proportional to 953.07, 1,428.89 and 644.05 is: 965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.07 : 1,428.89 = 644.05 : x
  2. Step 2: Convert to fraction form
    953.07/1,428.89 = 644.05/x
  3. Step 3: Cross multiply
    953.07x = 1,428.89 × 644.05
  4. Step 4: Simplify right side
    953.07x = 920,274.99
  5. Step 5: Solve for x
    x = 920,274.99/953.07
  6. Step 6: Final answer
    x = 965.60

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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.