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Finding the Fourth Proportional to 692.88, 1,031.63 and 683.20

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Solution

The fourth proportional to 692.88, 1,031.63 and 683.20 is: 1,017.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.88 : 1,031.63 = 683.20 : x
  2. Step 2: Convert to fraction form
    692.88/1,031.63 = 683.20/x
  3. Step 3: Cross multiply
    692.88x = 1,031.63 × 683.20
  4. Step 4: Simplify right side
    692.88x = 704,808.74
  5. Step 5: Solve for x
    x = 704,808.74/692.88
  6. Step 6: Final answer
    x = 1,017.21

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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.