Home / 20,255.40-30,383.10-12,868.20

Finding the Fourth Proportional to 20,255.40, 30,383.10 and 12,868.20

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Solution

The fourth proportional to 20,255.40, 30,383.10 and 12,868.20 is: 19,302.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,255.40 : 30,383.10 = 12,868.20 : x
  2. Step 2: Convert to fraction form
    20,255.40/30,383.10 = 12,868.20/x
  3. Step 3: Cross multiply
    20,255.40x = 30,383.10 × 12,868.20
  4. Step 4: Simplify right side
    20,255.40x = 390,975,807.42
  5. Step 5: Solve for x
    x = 390,975,807.42/20,255.40
  6. Step 6: Final answer
    x = 19,302.30

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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.