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Finding the Fourth Proportional to 692.72, 1,039.80 and 474.20

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Solution

The fourth proportional to 692.72, 1,039.80 and 474.20 is: 711.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.72 : 1,039.80 = 474.20 : x
  2. Step 2: Convert to fraction form
    692.72/1,039.80 = 474.20/x
  3. Step 3: Cross multiply
    692.72x = 1,039.80 × 474.20
  4. Step 4: Simplify right side
    692.72x = 493,073.16
  5. Step 5: Solve for x
    x = 493,073.16/692.72
  6. Step 6: Final answer
    x = 711.79

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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.