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Finding the Fourth Proportional to 692.76, 1,038.33 and 670.08

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Solution

The fourth proportional to 692.76, 1,038.33 and 670.08 is: 1,004.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.76 : 1,038.33 = 670.08 : x
  2. Step 2: Convert to fraction form
    692.76/1,038.33 = 670.08/x
  3. Step 3: Cross multiply
    692.76x = 1,038.33 × 670.08
  4. Step 4: Simplify right side
    692.76x = 695,764.17
  5. Step 5: Solve for x
    x = 695,764.17/692.76
  6. Step 6: Final answer
    x = 1,004.34

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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.