Home / 15,493.54-21,380.64-8,781.33

Finding the Fourth Proportional to 15,493.54, 21,380.64 and 8,781.33

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Solution

The fourth proportional to 15,493.54, 21,380.64 and 8,781.33 is: 12,117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,493.54 : 21,380.64 = 8,781.33 : x
  2. Step 2: Convert to fraction form
    15,493.54/21,380.64 = 8,781.33/x
  3. Step 3: Cross multiply
    15,493.54x = 21,380.64 × 8,781.33
  4. Step 4: Simplify right side
    15,493.54x = 187,750,486.95
  5. Step 5: Solve for x
    x = 187,750,486.95/15,493.54
  6. Step 6: Final answer
    x = 12,117.99

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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.