Home / 15,785.28-21,784.32-8,712

Finding the Fourth Proportional to 15,785.28, 21,784.32 and 8,712

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Solution

The fourth proportional to 15,785.28, 21,784.32 and 8,712 is: 12,022.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,785.28 : 21,784.32 = 8,712 : x
  2. Step 2: Convert to fraction form
    15,785.28/21,784.32 = 8,712/x
  3. Step 3: Cross multiply
    15,785.28x = 21,784.32 × 8,712
  4. Step 4: Simplify right side
    15,785.28x = 189,784,995.84
  5. Step 5: Solve for x
    x = 189,784,995.84/15,785.28
  6. Step 6: Final answer
    x = 12,022.91

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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.