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Finding the Fourth Proportional to 1,277.12, 1,915.99 and 692.71

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Solution

The fourth proportional to 1,277.12, 1,915.99 and 692.71 is: 1,039.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.12 : 1,915.99 = 692.71 : x
  2. Step 2: Convert to fraction form
    1,277.12/1,915.99 = 692.71/x
  3. Step 3: Cross multiply
    1,277.12x = 1,915.99 × 692.71
  4. Step 4: Simplify right side
    1,277.12x = 1,327,218.91
  5. Step 5: Solve for x
    x = 1,327,218.91/1,277.12
  6. Step 6: Final answer
    x = 1,039.23

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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.