Home / 20,856.47-28,782.63-11,425.64

Finding the Fourth Proportional to 20,856.47, 28,782.63 and 11,425.64

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Solution

The fourth proportional to 20,856.47, 28,782.63 and 11,425.64 is: 15,767.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.47 : 28,782.63 = 11,425.64 : x
  2. Step 2: Convert to fraction form
    20,856.47/28,782.63 = 11,425.64/x
  3. Step 3: Cross multiply
    20,856.47x = 28,782.63 × 11,425.64
  4. Step 4: Simplify right side
    20,856.47x = 328,859,824.72
  5. Step 5: Solve for x
    x = 328,859,824.72/20,856.47
  6. Step 6: Final answer
    x = 15,767.76

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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.