Home / 15,786.15-21,783.36-8,712.10

Finding the Fourth Proportional to 15,786.15, 21,783.36 and 8,712.10

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Solution

The fourth proportional to 15,786.15, 21,783.36 and 8,712.10 is: 12,021.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.15 : 21,783.36 = 8,712.10 : x
  2. Step 2: Convert to fraction form
    15,786.15/21,783.36 = 8,712.10/x
  3. Step 3: Cross multiply
    15,786.15x = 21,783.36 × 8,712.10
  4. Step 4: Simplify right side
    15,786.15x = 189,778,810.66
  5. Step 5: Solve for x
    x = 189,778,810.66/15,786.15
  6. Step 6: Final answer
    x = 12,021.86

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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.