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Finding the Fourth Proportional to 12,879.80, 19,322.10 and 4,117.20

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Solution

The fourth proportional to 12,879.80, 19,322.10 and 4,117.20 is: 6,176.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.80 : 19,322.10 = 4,117.20 : x
  2. Step 2: Convert to fraction form
    12,879.80/19,322.10 = 4,117.20/x
  3. Step 3: Cross multiply
    12,879.80x = 19,322.10 × 4,117.20
  4. Step 4: Simplify right side
    12,879.80x = 79,552,950.12
  5. Step 5: Solve for x
    x = 79,552,950.12/12,879.80
  6. Step 6: Final answer
    x = 6,176.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.