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Finding the Fourth Proportional to 12,781.80, 17,635.44 and 7,477.92

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Solution

The fourth proportional to 12,781.80, 17,635.44 and 7,477.92 is: 10,317.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.80 : 17,635.44 = 7,477.92 : x
  2. Step 2: Convert to fraction form
    12,781.80/17,635.44 = 7,477.92/x
  3. Step 3: Cross multiply
    12,781.80x = 17,635.44 × 7,477.92
  4. Step 4: Simplify right side
    12,781.80x = 131,876,409.48
  5. Step 5: Solve for x
    x = 131,876,409.48/12,781.80
  6. Step 6: Final answer
    x = 10,317.51

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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.