Home / 15,712.67-21,682.91-8,639.03

Finding the Fourth Proportional to 15,712.67, 21,682.91 and 8,639.03

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Solution

The fourth proportional to 15,712.67, 21,682.91 and 8,639.03 is: 11,921.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,712.67 : 21,682.91 = 8,639.03 : x
  2. Step 2: Convert to fraction form
    15,712.67/21,682.91 = 8,639.03/x
  3. Step 3: Cross multiply
    15,712.67x = 21,682.91 × 8,639.03
  4. Step 4: Simplify right side
    15,712.67x = 187,319,385.78
  5. Step 5: Solve for x
    x = 187,319,385.78/15,712.67
  6. Step 6: Final answer
    x = 11,921.55

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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.