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Finding the Fourth Proportional to 953.21, 1,428.89 and 367.78

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Solution

The fourth proportional to 953.21, 1,428.89 and 367.78 is: 551.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.21 : 1,428.89 = 367.78 : x
  2. Step 2: Convert to fraction form
    953.21/1,428.89 = 367.78/x
  3. Step 3: Cross multiply
    953.21x = 1,428.89 × 367.78
  4. Step 4: Simplify right side
    953.21x = 525,510.02
  5. Step 5: Solve for x
    x = 525,510.02/953.21
  6. Step 6: Final answer
    x = 551.31

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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.