Home / 20,785.70-31,178.55-18,539.30

Finding the Fourth Proportional to 20,785.70, 31,178.55 and 18,539.30

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Solution

The fourth proportional to 20,785.70, 31,178.55 and 18,539.30 is: 27,808.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,785.70 : 31,178.55 = 18,539.30 : x
  2. Step 2: Convert to fraction form
    20,785.70/31,178.55 = 18,539.30/x
  3. Step 3: Cross multiply
    20,785.70x = 31,178.55 × 18,539.30
  4. Step 4: Simplify right side
    20,785.70x = 578,028,492.02
  5. Step 5: Solve for x
    x = 578,028,492.02/20,785.70
  6. Step 6: Final answer
    x = 27,808.95

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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.