Home / 20,211.35-30,320.42-9,117.77

Finding the Fourth Proportional to 20,211.35, 30,320.42 and 9,117.77

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Solution

The fourth proportional to 20,211.35, 30,320.42 and 9,117.77 is: 13,678.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,211.35 : 30,320.42 = 9,117.77 : x
  2. Step 2: Convert to fraction form
    20,211.35/30,320.42 = 9,117.77/x
  3. Step 3: Cross multiply
    20,211.35x = 30,320.42 × 9,117.77
  4. Step 4: Simplify right side
    20,211.35x = 276,454,418.67
  5. Step 5: Solve for x
    x = 276,454,418.67/20,211.35
  6. Step 6: Final answer
    x = 13,678.18

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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.