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Finding the Fourth Proportional to 692.40, 1,039.28 and 419.02

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Solution

The fourth proportional to 692.40, 1,039.28 and 419.02 is: 628.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.40 : 1,039.28 = 419.02 : x
  2. Step 2: Convert to fraction form
    692.40/1,039.28 = 419.02/x
  3. Step 3: Cross multiply
    692.40x = 1,039.28 × 419.02
  4. Step 4: Simplify right side
    692.40x = 435,482.62
  5. Step 5: Solve for x
    x = 435,482.62/692.40
  6. Step 6: Final answer
    x = 628.95

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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.