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Finding the Fourth Proportional to 18,883.70, 28,336.49 and 7,788.32

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Solution

The fourth proportional to 18,883.70, 28,336.49 and 7,788.32 is: 11,686.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,883.70 : 28,336.49 = 7,788.32 : x
  2. Step 2: Convert to fraction form
    18,883.70/28,336.49 = 7,788.32/x
  3. Step 3: Cross multiply
    18,883.70x = 28,336.49 × 7,788.32
  4. Step 4: Simplify right side
    18,883.70x = 220,693,612.86
  5. Step 5: Solve for x
    x = 220,693,612.86/18,883.70
  6. Step 6: Final answer
    x = 11,686.99

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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.