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Finding the Fourth Proportional to 12,611.76, 17,406.30 and 9,621.94

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Solution

The fourth proportional to 12,611.76, 17,406.30 and 9,621.94 is: 13,279.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,611.76 : 17,406.30 = 9,621.94 : x
  2. Step 2: Convert to fraction form
    12,611.76/17,406.30 = 9,621.94/x
  3. Step 3: Cross multiply
    12,611.76x = 17,406.30 × 9,621.94
  4. Step 4: Simplify right side
    12,611.76x = 167,482,374.22
  5. Step 5: Solve for x
    x = 167,482,374.22/12,611.76
  6. Step 6: Final answer
    x = 13,279.86

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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.