Home / 20,155.83-27,807.29-12,985.21

Finding the Fourth Proportional to 20,155.83, 27,807.29 and 12,985.21

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Solution

The fourth proportional to 20,155.83, 27,807.29 and 12,985.21 is: 17,914.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,155.83 : 27,807.29 = 12,985.21 : x
  2. Step 2: Convert to fraction form
    20,155.83/27,807.29 = 12,985.21/x
  3. Step 3: Cross multiply
    20,155.83x = 27,807.29 × 12,985.21
  4. Step 4: Simplify right side
    20,155.83x = 361,083,361.14
  5. Step 5: Solve for x
    x = 361,083,361.14/20,155.83
  6. Step 6: Final answer
    x = 17,914.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.