Home / 15,709.76-21,680.80-8,637.60

Finding the Fourth Proportional to 15,709.76, 21,680.80 and 8,637.60

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Solution

The fourth proportional to 15,709.76, 21,680.80 and 8,637.60 is: 11,920.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.76 : 21,680.80 = 8,637.60 : x
  2. Step 2: Convert to fraction form
    15,709.76/21,680.80 = 8,637.60/x
  3. Step 3: Cross multiply
    15,709.76x = 21,680.80 × 8,637.60
  4. Step 4: Simplify right side
    15,709.76x = 187,270,078.08
  5. Step 5: Solve for x
    x = 187,270,078.08/15,709.76
  6. Step 6: Final answer
    x = 11,920.62

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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.