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Finding the Fourth Proportional to 18,981.90, 28,477.62 and 8,590.86

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Solution

The fourth proportional to 18,981.90, 28,477.62 and 8,590.86 is: 12,888.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981.90 : 28,477.62 = 8,590.86 : x
  2. Step 2: Convert to fraction form
    18,981.90/28,477.62 = 8,590.86/x
  3. Step 3: Cross multiply
    18,981.90x = 28,477.62 × 8,590.86
  4. Step 4: Simplify right side
    18,981.90x = 244,647,246.55
  5. Step 5: Solve for x
    x = 244,647,246.55/18,981.90
  6. Step 6: Final answer
    x = 12,888.45

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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.