Home / 19,920.72-27,479.20-12,455.76

Finding the Fourth Proportional to 19,920.72, 27,479.20 and 12,455.76

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Solution

The fourth proportional to 19,920.72, 27,479.20 and 12,455.76 is: 17,181.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.72 : 27,479.20 = 12,455.76 : x
  2. Step 2: Convert to fraction form
    19,920.72/27,479.20 = 12,455.76/x
  3. Step 3: Cross multiply
    19,920.72x = 27,479.20 × 12,455.76
  4. Step 4: Simplify right side
    19,920.72x = 342,274,320.19
  5. Step 5: Solve for x
    x = 342,274,320.19/19,920.72
  6. Step 6: Final answer
    x = 17,181.82

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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.