Home / 20,820.04-31,215.36-7,670.68

Finding the Fourth Proportional to 20,820.04, 31,215.36 and 7,670.68

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Solution

The fourth proportional to 20,820.04, 31,215.36 and 7,670.68 is: 11,500.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.04 : 31,215.36 = 7,670.68 : x
  2. Step 2: Convert to fraction form
    20,820.04/31,215.36 = 7,670.68/x
  3. Step 3: Cross multiply
    20,820.04x = 31,215.36 × 7,670.68
  4. Step 4: Simplify right side
    20,820.04x = 239,443,037.64
  5. Step 5: Solve for x
    x = 239,443,037.64/20,820.04
  6. Step 6: Final answer
    x = 11,500.60

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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.