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Finding the Fourth Proportional to 692.54, 1,038.70 and 230.28

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Solution

The fourth proportional to 692.54, 1,038.70 and 230.28 is: 345.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.54 : 1,038.70 = 230.28 : x
  2. Step 2: Convert to fraction form
    692.54/1,038.70 = 230.28/x
  3. Step 3: Cross multiply
    692.54x = 1,038.70 × 230.28
  4. Step 4: Simplify right side
    692.54x = 239,191.84
  5. Step 5: Solve for x
    x = 239,191.84/692.54
  6. Step 6: Final answer
    x = 345.38

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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.