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Finding the Fourth Proportional to 18,657.90, 28,002.15 and 18,512.10

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Solution

The fourth proportional to 18,657.90, 28,002.15 and 18,512.10 is: 27,783.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,657.90 : 28,002.15 = 18,512.10 : x
  2. Step 2: Convert to fraction form
    18,657.90/28,002.15 = 18,512.10/x
  3. Step 3: Cross multiply
    18,657.90x = 28,002.15 × 18,512.10
  4. Step 4: Simplify right side
    18,657.90x = 518,378,601.02
  5. Step 5: Solve for x
    x = 518,378,601.02/18,657.90
  6. Step 6: Final answer
    x = 27,783.33

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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.