Home / 20,712.20-31,068.30-15,139.40

Finding the Fourth Proportional to 20,712.20, 31,068.30 and 15,139.40

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Solution

The fourth proportional to 20,712.20, 31,068.30 and 15,139.40 is: 22,709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.20 : 31,068.30 = 15,139.40 : x
  2. Step 2: Convert to fraction form
    20,712.20/31,068.30 = 15,139.40/x
  3. Step 3: Cross multiply
    20,712.20x = 31,068.30 × 15,139.40
  4. Step 4: Simplify right side
    20,712.20x = 470,355,421.02
  5. Step 5: Solve for x
    x = 470,355,421.02/20,712.20
  6. Step 6: Final answer
    x = 22,709.10

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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.