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Finding the Fourth Proportional to 692.13, 1,038.30 and 345.86

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Solution

The fourth proportional to 692.13, 1,038.30 and 345.86 is: 518.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.13 : 1,038.30 = 345.86 : x
  2. Step 2: Convert to fraction form
    692.13/1,038.30 = 345.86/x
  3. Step 3: Cross multiply
    692.13x = 1,038.30 × 345.86
  4. Step 4: Simplify right side
    692.13x = 359,106.44
  5. Step 5: Solve for x
    x = 359,106.44/692.13
  6. Step 6: Final answer
    x = 518.84

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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.