Home / 20,880.60-31,320.45-13,905.30

Finding the Fourth Proportional to 20,880.60, 31,320.45 and 13,905.30

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Solution

The fourth proportional to 20,880.60, 31,320.45 and 13,905.30 is: 20,857.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.60 : 31,320.45 = 13,905.30 : x
  2. Step 2: Convert to fraction form
    20,880.60/31,320.45 = 13,905.30/x
  3. Step 3: Cross multiply
    20,880.60x = 31,320.45 × 13,905.30
  4. Step 4: Simplify right side
    20,880.60x = 435,520,253.39
  5. Step 5: Solve for x
    x = 435,520,253.39/20,880.60
  6. Step 6: Final answer
    x = 20,857.65

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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.