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Finding the Fourth Proportional to 692.35, 1,039.28 and 615.81

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Solution

The fourth proportional to 692.35, 1,039.28 and 615.81 is: 924.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.35 : 1,039.28 = 615.81 : x
  2. Step 2: Convert to fraction form
    692.35/1,039.28 = 615.81/x
  3. Step 3: Cross multiply
    692.35x = 1,039.28 × 615.81
  4. Step 4: Simplify right side
    692.35x = 639,990.74
  5. Step 5: Solve for x
    x = 639,990.74/692.35
  6. Step 6: Final answer
    x = 924.37

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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.