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Finding the Fourth Proportional to 12,390.68, 17,102.19 and 7,611.78

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Solution

The fourth proportional to 12,390.68, 17,102.19 and 7,611.78 is: 10,506.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.68 : 17,102.19 = 7,611.78 : x
  2. Step 2: Convert to fraction form
    12,390.68/17,102.19 = 7,611.78/x
  3. Step 3: Cross multiply
    12,390.68x = 17,102.19 × 7,611.78
  4. Step 4: Simplify right side
    12,390.68x = 130,178,107.80
  5. Step 5: Solve for x
    x = 130,178,107.80/12,390.68
  6. Step 6: Final answer
    x = 10,506.13

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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.