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Finding the Fourth Proportional to 712.12, 1,063.16 and 643

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Solution

The fourth proportional to 712.12, 1,063.16 and 643 is: 959.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.12 : 1,063.16 = 643 : x
  2. Step 2: Convert to fraction form
    712.12/1,063.16 = 643/x
  3. Step 3: Cross multiply
    712.12x = 1,063.16 × 643
  4. Step 4: Simplify right side
    712.12x = 683,611.88
  5. Step 5: Solve for x
    x = 683,611.88/712.12
  6. Step 6: Final answer
    x = 959.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.