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Finding the Fourth Proportional to 692.40, 1,039.28 and 509.28

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Solution

The fourth proportional to 692.40, 1,039.28 and 509.28 is: 764.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.40 : 1,039.28 = 509.28 : x
  2. Step 2: Convert to fraction form
    692.40/1,039.28 = 509.28/x
  3. Step 3: Cross multiply
    692.40x = 1,039.28 × 509.28
  4. Step 4: Simplify right side
    692.40x = 529,284.52
  5. Step 5: Solve for x
    x = 529,284.52/692.40
  6. Step 6: Final answer
    x = 764.42

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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.