Home / 15,845.43-21,869-9,129.76

Finding the Fourth Proportional to 15,845.43, 21,869 and 9,129.76

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Solution

The fourth proportional to 15,845.43, 21,869 and 9,129.76 is: 12,600.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,845.43 : 21,869 = 9,129.76 : x
  2. Step 2: Convert to fraction form
    15,845.43/21,869 = 9,129.76/x
  3. Step 3: Cross multiply
    15,845.43x = 21,869 × 9,129.76
  4. Step 4: Simplify right side
    15,845.43x = 199,658,721.44
  5. Step 5: Solve for x
    x = 199,658,721.44/15,845.43
  6. Step 6: Final answer
    x = 12,600.40

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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.