Home / 20,649.57-28,498.13-12,693.75

Finding the Fourth Proportional to 20,649.57, 28,498.13 and 12,693.75

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Solution

The fourth proportional to 20,649.57, 28,498.13 and 12,693.75 is: 17,518.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.57 : 28,498.13 = 12,693.75 : x
  2. Step 2: Convert to fraction form
    20,649.57/28,498.13 = 12,693.75/x
  3. Step 3: Cross multiply
    20,649.57x = 28,498.13 × 12,693.75
  4. Step 4: Simplify right side
    20,649.57x = 361,748,137.69
  5. Step 5: Solve for x
    x = 361,748,137.69/20,649.57
  6. Step 6: Final answer
    x = 17,518.43

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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.