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Finding the Fourth Proportional to 12,990, 17,927.16 and 7,402.80

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Solution

The fourth proportional to 12,990, 17,927.16 and 7,402.80 is: 10,216.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990 : 17,927.16 = 7,402.80 : x
  2. Step 2: Convert to fraction form
    12,990/17,927.16 = 7,402.80/x
  3. Step 3: Cross multiply
    12,990x = 17,927.16 × 7,402.80
  4. Step 4: Simplify right side
    12,990x = 132,711,180.05
  5. Step 5: Solve for x
    x = 132,711,180.05/12,990
  6. Step 6: Final answer
    x = 10,216.41

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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.