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Finding the Fourth Proportional to 14,405.12, 19,879.07 and 7,781.12

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Solution

The fourth proportional to 14,405.12, 19,879.07 and 7,781.12 is: 10,737.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,405.12 : 19,879.07 = 7,781.12 : x
  2. Step 2: Convert to fraction form
    14,405.12/19,879.07 = 7,781.12/x
  3. Step 3: Cross multiply
    14,405.12x = 19,879.07 × 7,781.12
  4. Step 4: Simplify right side
    14,405.12x = 154,681,429.16
  5. Step 5: Solve for x
    x = 154,681,429.16/14,405.12
  6. Step 6: Final answer
    x = 10,737.95

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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.