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Finding the Fourth Proportional to 13,959.80, 20,939.70 and 8,430.20

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Solution

The fourth proportional to 13,959.80, 20,939.70 and 8,430.20 is: 12,645.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,959.80 : 20,939.70 = 8,430.20 : x
  2. Step 2: Convert to fraction form
    13,959.80/20,939.70 = 8,430.20/x
  3. Step 3: Cross multiply
    13,959.80x = 20,939.70 × 8,430.20
  4. Step 4: Simplify right side
    13,959.80x = 176,525,858.94
  5. Step 5: Solve for x
    x = 176,525,858.94/13,959.80
  6. Step 6: Final answer
    x = 12,645.30

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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.