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Finding the Fourth Proportional to 12,090.68, 16,692.92 and 8,312.64

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Solution

The fourth proportional to 12,090.68, 16,692.92 and 8,312.64 is: 11,476.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,090.68 : 16,692.92 = 8,312.64 : x
  2. Step 2: Convert to fraction form
    12,090.68/16,692.92 = 8,312.64/x
  3. Step 3: Cross multiply
    12,090.68x = 16,692.92 × 8,312.64
  4. Step 4: Simplify right side
    12,090.68x = 138,762,234.51
  5. Step 5: Solve for x
    x = 138,762,234.51/12,090.68
  6. Step 6: Final answer
    x = 11,476.79

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1.5x scale

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.