Home / 15,857.22-21,881.20-8,781.87

Finding the Fourth Proportional to 15,857.22, 21,881.20 and 8,781.87

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Solution

The fourth proportional to 15,857.22, 21,881.20 and 8,781.87 is: 12,118.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,857.22 : 21,881.20 = 8,781.87 : x
  2. Step 2: Convert to fraction form
    15,857.22/21,881.20 = 8,781.87/x
  3. Step 3: Cross multiply
    15,857.22x = 21,881.20 × 8,781.87
  4. Step 4: Simplify right side
    15,857.22x = 192,157,853.84
  5. Step 5: Solve for x
    x = 192,157,853.84/15,857.22
  6. Step 6: Final answer
    x = 12,118.00

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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.