Home / 15,781.21-21,777.08-8,707.63

Finding the Fourth Proportional to 15,781.21, 21,777.08 and 8,707.63

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Solution

The fourth proportional to 15,781.21, 21,777.08 and 8,707.63 is: 12,015.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.21 : 21,777.08 = 8,707.63 : x
  2. Step 2: Convert to fraction form
    15,781.21/21,777.08 = 8,707.63/x
  3. Step 3: Cross multiply
    15,781.21x = 21,777.08 × 8,707.63
  4. Step 4: Simplify right side
    15,781.21x = 189,626,755.12
  5. Step 5: Solve for x
    x = 189,626,755.12/15,781.21
  6. Step 6: Final answer
    x = 12,015.98

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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.