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Finding the Fourth Proportional to 692.94, 1,039.68 and 487.02

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Solution

The fourth proportional to 692.94, 1,039.68 and 487.02 is: 730.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.94 : 1,039.68 = 487.02 : x
  2. Step 2: Convert to fraction form
    692.94/1,039.68 = 487.02/x
  3. Step 3: Cross multiply
    692.94x = 1,039.68 × 487.02
  4. Step 4: Simplify right side
    692.94x = 506,344.95
  5. Step 5: Solve for x
    x = 506,344.95/692.94
  6. Step 6: Final answer
    x = 730.72

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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.