Home / 20,531.60-30,748.80-12,658.40

Finding the Fourth Proportional to 20,531.60, 30,748.80 and 12,658.40

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Solution

The fourth proportional to 20,531.60, 30,748.80 and 12,658.40 is: 18,957.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.60 : 30,748.80 = 12,658.40 : x
  2. Step 2: Convert to fraction form
    20,531.60/30,748.80 = 12,658.40/x
  3. Step 3: Cross multiply
    20,531.60x = 30,748.80 × 12,658.40
  4. Step 4: Simplify right side
    20,531.60x = 389,230,609.92
  5. Step 5: Solve for x
    x = 389,230,609.92/20,531.60
  6. Step 6: Final answer
    x = 18,957.64

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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.