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Finding the Fourth Proportional to 964.21, 1,330.61 and 522.11

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Solution

The fourth proportional to 964.21, 1,330.61 and 522.11 is: 720.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.21 : 1,330.61 = 522.11 : x
  2. Step 2: Convert to fraction form
    964.21/1,330.61 = 522.11/x
  3. Step 3: Cross multiply
    964.21x = 1,330.61 × 522.11
  4. Step 4: Simplify right side
    964.21x = 694,724.79
  5. Step 5: Solve for x
    x = 694,724.79/964.21
  6. Step 6: Final answer
    x = 720.51

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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.