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Finding the Fourth Proportional to 12,690.90, 17,510.49 and 7,382.70

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Solution

The fourth proportional to 12,690.90, 17,510.49 and 7,382.70 is: 10,186.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.90 : 17,510.49 = 7,382.70 : x
  2. Step 2: Convert to fraction form
    12,690.90/17,510.49 = 7,382.70/x
  3. Step 3: Cross multiply
    12,690.90x = 17,510.49 × 7,382.70
  4. Step 4: Simplify right side
    12,690.90x = 129,274,694.52
  5. Step 5: Solve for x
    x = 129,274,694.52/12,690.90
  6. Step 6: Final answer
    x = 10,186.41

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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.