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Finding the Fourth Proportional to 964.31, 1,330.74 and 522.21

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Solution

The fourth proportional to 964.31, 1,330.74 and 522.21 is: 720.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.31 : 1,330.74 = 522.21 : x
  2. Step 2: Convert to fraction form
    964.31/1,330.74 = 522.21/x
  3. Step 3: Cross multiply
    964.31x = 1,330.74 × 522.21
  4. Step 4: Simplify right side
    964.31x = 694,925.96
  5. Step 5: Solve for x
    x = 694,925.96/964.31
  6. Step 6: Final answer
    x = 720.65

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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.