Home / 20,461.20-30,720.60-12,685.20

Finding the Fourth Proportional to 20,461.20, 30,720.60 and 12,685.20

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Solution

The fourth proportional to 20,461.20, 30,720.60 and 12,685.20 is: 19,045.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,461.20 : 30,720.60 = 12,685.20 : x
  2. Step 2: Convert to fraction form
    20,461.20/30,720.60 = 12,685.20/x
  3. Step 3: Cross multiply
    20,461.20x = 30,720.60 × 12,685.20
  4. Step 4: Simplify right side
    20,461.20x = 389,696,955.12
  5. Step 5: Solve for x
    x = 389,696,955.12/20,461.20
  6. Step 6: Final answer
    x = 19,045.65

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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.