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Finding the Fourth Proportional to 692.18, 1,038.38 and 345.53

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Solution

The fourth proportional to 692.18, 1,038.38 and 345.53 is: 518.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.18 : 1,038.38 = 345.53 : x
  2. Step 2: Convert to fraction form
    692.18/1,038.38 = 345.53/x
  3. Step 3: Cross multiply
    692.18x = 1,038.38 × 345.53
  4. Step 4: Simplify right side
    692.18x = 358,784.52
  5. Step 5: Solve for x
    x = 358,784.52/692.18
  6. Step 6: Final answer
    x = 518.34

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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.