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Finding the Fourth Proportional to 1,252.21, 1,727.95 and 692.55

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Solution

The fourth proportional to 1,252.21, 1,727.95 and 692.55 is: 955.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.21 : 1,727.95 = 692.55 : x
  2. Step 2: Convert to fraction form
    1,252.21/1,727.95 = 692.55/x
  3. Step 3: Cross multiply
    1,252.21x = 1,727.95 × 692.55
  4. Step 4: Simplify right side
    1,252.21x = 1,196,691.77
  5. Step 5: Solve for x
    x = 1,196,691.77/1,252.21
  6. Step 6: Final answer
    x = 955.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.