Home / 20,871.18-31,287.78-7,720.20

Finding the Fourth Proportional to 20,871.18, 31,287.78 and 7,720.20

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Solution

The fourth proportional to 20,871.18, 31,287.78 and 7,720.20 is: 11,573.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.18 : 31,287.78 = 7,720.20 : x
  2. Step 2: Convert to fraction form
    20,871.18/31,287.78 = 7,720.20/x
  3. Step 3: Cross multiply
    20,871.18x = 31,287.78 × 7,720.20
  4. Step 4: Simplify right side
    20,871.18x = 241,547,919.16
  5. Step 5: Solve for x
    x = 241,547,919.16/20,871.18
  6. Step 6: Final answer
    x = 11,573.28

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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.