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Finding the Fourth Proportional to 12,999.71, 17,939.73 and 7,031.49

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Solution

The fourth proportional to 12,999.71, 17,939.73 and 7,031.49 is: 9,703.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.71 : 17,939.73 = 7,031.49 : x
  2. Step 2: Convert to fraction form
    12,999.71/17,939.73 = 7,031.49/x
  3. Step 3: Cross multiply
    12,999.71x = 17,939.73 × 7,031.49
  4. Step 4: Simplify right side
    12,999.71x = 126,143,032.10
  5. Step 5: Solve for x
    x = 126,143,032.10/12,999.71
  6. Step 6: Final answer
    x = 9,703.53

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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.