Home / 20,742.89-31,114.26-12,425.40

Finding the Fourth Proportional to 20,742.89, 31,114.26 and 12,425.40

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Solution

The fourth proportional to 20,742.89, 31,114.26 and 12,425.40 is: 18,638.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.89 : 31,114.26 = 12,425.40 : x
  2. Step 2: Convert to fraction form
    20,742.89/31,114.26 = 12,425.40/x
  3. Step 3: Cross multiply
    20,742.89x = 31,114.26 × 12,425.40
  4. Step 4: Simplify right side
    20,742.89x = 386,607,126.20
  5. Step 5: Solve for x
    x = 386,607,126.20/20,742.89
  6. Step 6: Final answer
    x = 18,638.06

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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.