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Finding the Fourth Proportional to 645.40, 966.90 and 576.16

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Solution

The fourth proportional to 645.40, 966.90 and 576.16 is: 863.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.40 : 966.90 = 576.16 : x
  2. Step 2: Convert to fraction form
    645.40/966.90 = 576.16/x
  3. Step 3: Cross multiply
    645.40x = 966.90 × 576.16
  4. Step 4: Simplify right side
    645.40x = 557,089.10
  5. Step 5: Solve for x
    x = 557,089.10/645.40
  6. Step 6: Final answer
    x = 863.17

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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.