Home / 20,888.71-31,325.75-12,570.21

Finding the Fourth Proportional to 20,888.71, 31,325.75 and 12,570.21

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Solution

The fourth proportional to 20,888.71, 31,325.75 and 12,570.21 is: 18,850.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.71 : 31,325.75 = 12,570.21 : x
  2. Step 2: Convert to fraction form
    20,888.71/31,325.75 = 12,570.21/x
  3. Step 3: Cross multiply
    20,888.71x = 31,325.75 × 12,570.21
  4. Step 4: Simplify right side
    20,888.71x = 393,771,310.90
  5. Step 5: Solve for x
    x = 393,771,310.90/20,888.71
  6. Step 6: Final answer
    x = 18,850.92

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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.