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Finding the Fourth Proportional to 11,890.60, 17,814.30 and 9,687.40

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Solution

The fourth proportional to 11,890.60, 17,814.30 and 9,687.40 is: 14,513.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,890.60 : 17,814.30 = 9,687.40 : x
  2. Step 2: Convert to fraction form
    11,890.60/17,814.30 = 9,687.40/x
  3. Step 3: Cross multiply
    11,890.60x = 17,814.30 × 9,687.40
  4. Step 4: Simplify right side
    11,890.60x = 172,574,249.82
  5. Step 5: Solve for x
    x = 172,574,249.82/11,890.60
  6. Step 6: Final answer
    x = 14,513.50

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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.