Home / 20,759.60-31,139.40-18,880.40

Finding the Fourth Proportional to 20,759.60, 31,139.40 and 18,880.40

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Solution

The fourth proportional to 20,759.60, 31,139.40 and 18,880.40 is: 28,320.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,759.60 : 31,139.40 = 18,880.40 : x
  2. Step 2: Convert to fraction form
    20,759.60/31,139.40 = 18,880.40/x
  3. Step 3: Cross multiply
    20,759.60x = 31,139.40 × 18,880.40
  4. Step 4: Simplify right side
    20,759.60x = 587,924,327.76
  5. Step 5: Solve for x
    x = 587,924,327.76/20,759.60
  6. Step 6: Final answer
    x = 28,320.60

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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.