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Finding the Fourth Proportional to 12,999.81, 17,939.67 and 7,031.46

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Solution

The fourth proportional to 12,999.81, 17,939.67 and 7,031.46 is: 9,703.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.81 : 17,939.67 = 7,031.46 : x
  2. Step 2: Convert to fraction form
    12,999.81/17,939.67 = 7,031.46/x
  3. Step 3: Cross multiply
    12,999.81x = 17,939.67 × 7,031.46
  4. Step 4: Simplify right side
    12,999.81x = 126,142,072.02
  5. Step 5: Solve for x
    x = 126,142,072.02/12,999.81
  6. Step 6: Final answer
    x = 9,703.38

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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.