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Finding the Fourth Proportional to 11,988.90, 17,988.03 and 7,609.86

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Solution

The fourth proportional to 11,988.90, 17,988.03 and 7,609.86 is: 11,417.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,988.90 : 17,988.03 = 7,609.86 : x
  2. Step 2: Convert to fraction form
    11,988.90/17,988.03 = 7,609.86/x
  3. Step 3: Cross multiply
    11,988.90x = 17,988.03 × 7,609.86
  4. Step 4: Simplify right side
    11,988.90x = 136,886,389.98
  5. Step 5: Solve for x
    x = 136,886,389.98/11,988.90
  6. Step 6: Final answer
    x = 11,417.76

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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.