Home / 20,622.69-28,459.80-12,660.39

Finding the Fourth Proportional to 20,622.69, 28,459.80 and 12,660.39

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Solution

The fourth proportional to 20,622.69, 28,459.80 and 12,660.39 is: 17,471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,622.69 : 28,459.80 = 12,660.39 : x
  2. Step 2: Convert to fraction form
    20,622.69/28,459.80 = 12,660.39/x
  3. Step 3: Cross multiply
    20,622.69x = 28,459.80 × 12,660.39
  4. Step 4: Simplify right side
    20,622.69x = 360,312,167.32
  5. Step 5: Solve for x
    x = 360,312,167.32/20,622.69
  6. Step 6: Final answer
    x = 17,471.64

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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.