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Finding the Fourth Proportional to 29,999.80, 45,005.10 and 12,471.40

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Solution

The fourth proportional to 29,999.80, 45,005.10 and 12,471.40 is: 18,709.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,999.80 : 45,005.10 = 12,471.40 : x
  2. Step 2: Convert to fraction form
    29,999.80/45,005.10 = 12,471.40/x
  3. Step 3: Cross multiply
    29,999.80x = 45,005.10 × 12,471.40
  4. Step 4: Simplify right side
    29,999.80x = 561,276,604.14
  5. Step 5: Solve for x
    x = 561,276,604.14/29,999.80
  6. Step 6: Final answer
    x = 18,709.34

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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.