Home / 15,781.36-21,777.96-8,707.76

Finding the Fourth Proportional to 15,781.36, 21,777.96 and 8,707.76

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Solution

The fourth proportional to 15,781.36, 21,777.96 and 8,707.76 is: 12,016.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.36 : 21,777.96 = 8,707.76 : x
  2. Step 2: Convert to fraction form
    15,781.36/21,777.96 = 8,707.76/x
  3. Step 3: Cross multiply
    15,781.36x = 21,777.96 × 8,707.76
  4. Step 4: Simplify right side
    15,781.36x = 189,637,248.97
  5. Step 5: Solve for x
    x = 189,637,248.97/15,781.36
  6. Step 6: Final answer
    x = 12,016.53

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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.