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Finding the Fourth Proportional to 692.88, 954.36 and 640.98

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Solution

The fourth proportional to 692.88, 954.36 and 640.98 is: 882.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.88 : 954.36 = 640.98 : x
  2. Step 2: Convert to fraction form
    692.88/954.36 = 640.98/x
  3. Step 3: Cross multiply
    692.88x = 954.36 × 640.98
  4. Step 4: Simplify right side
    692.88x = 611,725.67
  5. Step 5: Solve for x
    x = 611,725.67/692.88
  6. Step 6: Final answer
    x = 882.87

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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.