Home / 20,985.83-31,478.83-8,506.09

Finding the Fourth Proportional to 20,985.83, 31,478.83 and 8,506.09

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Solution

The fourth proportional to 20,985.83, 31,478.83 and 8,506.09 is: 12,759.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.83 : 31,478.83 = 8,506.09 : x
  2. Step 2: Convert to fraction form
    20,985.83/31,478.83 = 8,506.09/x
  3. Step 3: Cross multiply
    20,985.83x = 31,478.83 × 8,506.09
  4. Step 4: Simplify right side
    20,985.83x = 267,761,761.07
  5. Step 5: Solve for x
    x = 267,761,761.07/20,985.83
  6. Step 6: Final answer
    x = 12,759.17

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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.