Home / 20,720.10-31,080.15-6,869.10

Finding the Fourth Proportional to 20,720.10, 31,080.15 and 6,869.10

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Solution

The fourth proportional to 20,720.10, 31,080.15 and 6,869.10 is: 10,303.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.10 : 31,080.15 = 6,869.10 : x
  2. Step 2: Convert to fraction form
    20,720.10/31,080.15 = 6,869.10/x
  3. Step 3: Cross multiply
    20,720.10x = 31,080.15 × 6,869.10
  4. Step 4: Simplify right side
    20,720.10x = 213,492,658.37
  5. Step 5: Solve for x
    x = 213,492,658.37/20,720.10
  6. Step 6: Final answer
    x = 10,303.65

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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.