Home / 20,889.21-31,326.51-12,570.71

Finding the Fourth Proportional to 20,889.21, 31,326.51 and 12,570.71

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Solution

The fourth proportional to 20,889.21, 31,326.51 and 12,570.71 is: 18,851.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.21 : 31,326.51 = 12,570.71 : x
  2. Step 2: Convert to fraction form
    20,889.21/31,326.51 = 12,570.71/x
  3. Step 3: Cross multiply
    20,889.21x = 31,326.51 × 12,570.71
  4. Step 4: Simplify right side
    20,889.21x = 393,796,409.67
  5. Step 5: Solve for x
    x = 393,796,409.67/20,889.21
  6. Step 6: Final answer
    x = 18,851.67

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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.