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Finding the Fourth Proportional to 18,763.66, 28,135.08 and 7,678.12

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Solution

The fourth proportional to 18,763.66, 28,135.08 and 7,678.12 is: 11,512.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,763.66 : 28,135.08 = 7,678.12 : x
  2. Step 2: Convert to fraction form
    18,763.66/28,135.08 = 7,678.12/x
  3. Step 3: Cross multiply
    18,763.66x = 28,135.08 × 7,678.12
  4. Step 4: Simplify right side
    18,763.66x = 216,024,520.45
  5. Step 5: Solve for x
    x = 216,024,520.45/18,763.66
  6. Step 6: Final answer
    x = 11,512.92

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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.