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Finding the Fourth Proportional to 12,489.61, 17,235.66 and 6,900.61

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Solution

The fourth proportional to 12,489.61, 17,235.66 and 6,900.61 is: 9,522.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.61 : 17,235.66 = 6,900.61 : x
  2. Step 2: Convert to fraction form
    12,489.61/17,235.66 = 6,900.61/x
  3. Step 3: Cross multiply
    12,489.61x = 17,235.66 × 6,900.61
  4. Step 4: Simplify right side
    12,489.61x = 118,936,563.45
  5. Step 5: Solve for x
    x = 118,936,563.45/12,489.61
  6. Step 6: Final answer
    x = 9,522.84

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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.