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Finding the Fourth Proportional to 12,756.76, 17,621.18 and 10,639.22

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Solution

The fourth proportional to 12,756.76, 17,621.18 and 10,639.22 is: 14,696.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,756.76 : 17,621.18 = 10,639.22 : x
  2. Step 2: Convert to fraction form
    12,756.76/17,621.18 = 10,639.22/x
  3. Step 3: Cross multiply
    12,756.76x = 17,621.18 × 10,639.22
  4. Step 4: Simplify right side
    12,756.76x = 187,475,610.68
  5. Step 5: Solve for x
    x = 187,475,610.68/12,756.76
  6. Step 6: Final answer
    x = 14,696.18

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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.