Home / 20,740.80-28,615.20-12,774.72

Finding the Fourth Proportional to 20,740.80, 28,615.20 and 12,774.72

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Solution

The fourth proportional to 20,740.80, 28,615.20 and 12,774.72 is: 17,624.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,740.80 : 28,615.20 = 12,774.72 : x
  2. Step 2: Convert to fraction form
    20,740.80/28,615.20 = 12,774.72/x
  3. Step 3: Cross multiply
    20,740.80x = 28,615.20 × 12,774.72
  4. Step 4: Simplify right side
    20,740.80x = 365,551,167.74
  5. Step 5: Solve for x
    x = 365,551,167.74/20,740.80
  6. Step 6: Final answer
    x = 17,624.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.