Home / 20,911.05-28,855.35-12,411.72

Finding the Fourth Proportional to 20,911.05, 28,855.35 and 12,411.72

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Solution

The fourth proportional to 20,911.05, 28,855.35 and 12,411.72 is: 17,127.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.05 : 28,855.35 = 12,411.72 : x
  2. Step 2: Convert to fraction form
    20,911.05/28,855.35 = 12,411.72/x
  3. Step 3: Cross multiply
    20,911.05x = 28,855.35 × 12,411.72
  4. Step 4: Simplify right side
    20,911.05x = 358,144,524.70
  5. Step 5: Solve for x
    x = 358,144,524.70/20,911.05
  6. Step 6: Final answer
    x = 17,127.05

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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.