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Finding the Fourth Proportional to 20,886.80, 31,330.20 and 18,813.20

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Solution

The fourth proportional to 20,886.80, 31,330.20 and 18,813.20 is: 28,219.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.80 : 31,330.20 = 18,813.20 : x
  2. Step 2: Convert to fraction form
    20,886.80/31,330.20 = 18,813.20/x
  3. Step 3: Cross multiply
    20,886.80x = 31,330.20 × 18,813.20
  4. Step 4: Simplify right side
    20,886.80x = 589,421,318.64
  5. Step 5: Solve for x
    x = 589,421,318.64/20,886.80
  6. Step 6: Final answer
    x = 28,219.80

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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.