Home / 20,286.16-30,429.20-7,638.28

Finding the Fourth Proportional to 20,286.16, 30,429.20 and 7,638.28

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Solution

The fourth proportional to 20,286.16, 30,429.20 and 7,638.28 is: 11,457.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,286.16 : 30,429.20 = 7,638.28 : x
  2. Step 2: Convert to fraction form
    20,286.16/30,429.20 = 7,638.28/x
  3. Step 3: Cross multiply
    20,286.16x = 30,429.20 × 7,638.28
  4. Step 4: Simplify right side
    20,286.16x = 232,426,749.78
  5. Step 5: Solve for x
    x = 232,426,749.78/20,286.16
  6. Step 6: Final answer
    x = 11,457.40

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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.