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Finding the Fourth Proportional to 692.22, 1,038.66 and 345.54

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Solution

The fourth proportional to 692.22, 1,038.66 and 345.54 is: 518.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.22 : 1,038.66 = 345.54 : x
  2. Step 2: Convert to fraction form
    692.22/1,038.66 = 345.54/x
  3. Step 3: Cross multiply
    692.22x = 1,038.66 × 345.54
  4. Step 4: Simplify right side
    692.22x = 358,898.58
  5. Step 5: Solve for x
    x = 358,898.58/692.22
  6. Step 6: Final answer
    x = 518.47

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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.