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Finding the Fourth Proportional to 18,742.91, 28,128.18 and 8,882.15

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Solution

The fourth proportional to 18,742.91, 28,128.18 and 8,882.15 is: 13,329.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,742.91 : 28,128.18 = 8,882.15 : x
  2. Step 2: Convert to fraction form
    18,742.91/28,128.18 = 8,882.15/x
  3. Step 3: Cross multiply
    18,742.91x = 28,128.18 × 8,882.15
  4. Step 4: Simplify right side
    18,742.91x = 249,838,573.35
  5. Step 5: Solve for x
    x = 249,838,573.35/18,742.91
  6. Step 6: Final answer
    x = 13,329.77

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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.