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Finding the Fourth Proportional to 14,687.85, 20,269.35 and 8,636.47

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Solution

The fourth proportional to 14,687.85, 20,269.35 and 8,636.47 is: 11,918.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,687.85 : 20,269.35 = 8,636.47 : x
  2. Step 2: Convert to fraction form
    14,687.85/20,269.35 = 8,636.47/x
  3. Step 3: Cross multiply
    14,687.85x = 20,269.35 × 8,636.47
  4. Step 4: Simplify right side
    14,687.85x = 175,055,633.19
  5. Step 5: Solve for x
    x = 175,055,633.19/14,687.85
  6. Step 6: Final answer
    x = 11,918.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.