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Finding the Fourth Proportional to 18,820.76, 28,235.88 and 13,284.92

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Solution

The fourth proportional to 18,820.76, 28,235.88 and 13,284.92 is: 19,930.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820.76 : 28,235.88 = 13,284.92 : x
  2. Step 2: Convert to fraction form
    18,820.76/28,235.88 = 13,284.92/x
  3. Step 3: Cross multiply
    18,820.76x = 28,235.88 × 13,284.92
  4. Step 4: Simplify right side
    18,820.76x = 375,111,265.75
  5. Step 5: Solve for x
    x = 375,111,265.75/18,820.76
  6. Step 6: Final answer
    x = 19,930.72

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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.