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Finding the Fourth Proportional to 18,886.66, 28,314.87 and 12,652.90

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Solution

The fourth proportional to 18,886.66, 28,314.87 and 12,652.90 is: 18,969.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886.66 : 28,314.87 = 12,652.90 : x
  2. Step 2: Convert to fraction form
    18,886.66/28,314.87 = 12,652.90/x
  3. Step 3: Cross multiply
    18,886.66x = 28,314.87 × 12,652.90
  4. Step 4: Simplify right side
    18,886.66x = 358,265,218.62
  5. Step 5: Solve for x
    x = 358,265,218.62/18,886.66
  6. Step 6: Final answer
    x = 18,969.22

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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.