Home / 20,920.12-28,864.14-12,415.18

Finding the Fourth Proportional to 20,920.12, 28,864.14 and 12,415.18

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Solution

The fourth proportional to 20,920.12, 28,864.14 and 12,415.18 is: 17,129.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.12 : 28,864.14 = 12,415.18 : x
  2. Step 2: Convert to fraction form
    20,920.12/28,864.14 = 12,415.18/x
  3. Step 3: Cross multiply
    20,920.12x = 28,864.14 × 12,415.18
  4. Step 4: Simplify right side
    20,920.12x = 358,353,493.65
  5. Step 5: Solve for x
    x = 358,353,493.65/20,920.12
  6. Step 6: Final answer
    x = 17,129.61

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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.