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Finding the Fourth Proportional to 12,312.77, 18,472.04 and 3,992.78

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Solution

The fourth proportional to 12,312.77, 18,472.04 and 3,992.78 is: 5,990.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,312.77 : 18,472.04 = 3,992.78 : x
  2. Step 2: Convert to fraction form
    12,312.77/18,472.04 = 3,992.78/x
  3. Step 3: Cross multiply
    12,312.77x = 18,472.04 × 3,992.78
  4. Step 4: Simplify right side
    12,312.77x = 73,754,679.55
  5. Step 5: Solve for x
    x = 73,754,679.55/12,312.77
  6. Step 6: Final answer
    x = 5,990.10

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1.5x scale

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.