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Finding the Fourth Proportional to 12,989.57, 17,918.82 and 8,511.08

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Solution

The fourth proportional to 12,989.57, 17,918.82 and 8,511.08 is: 11,740.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.57 : 17,918.82 = 8,511.08 : x
  2. Step 2: Convert to fraction form
    12,989.57/17,918.82 = 8,511.08/x
  3. Step 3: Cross multiply
    12,989.57x = 17,918.82 × 8,511.08
  4. Step 4: Simplify right side
    12,989.57x = 152,508,420.93
  5. Step 5: Solve for x
    x = 152,508,420.93/12,989.57
  6. Step 6: Final answer
    x = 11,740.84

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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.