Home / 21,138.76-31,680.15-11,256.76

Finding the Fourth Proportional to 21,138.76, 31,680.15 and 11,256.76

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Solution

The fourth proportional to 21,138.76, 31,680.15 and 11,256.76 is: 16,870.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.76 : 31,680.15 = 11,256.76 : x
  2. Step 2: Convert to fraction form
    21,138.76/31,680.15 = 11,256.76/x
  3. Step 3: Cross multiply
    21,138.76x = 31,680.15 × 11,256.76
  4. Step 4: Simplify right side
    21,138.76x = 356,615,845.31
  5. Step 5: Solve for x
    x = 356,615,845.31/21,138.76
  6. Step 6: Final answer
    x = 16,870.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.