Home / 20,911.87-28,852.77-12,406.92

Finding the Fourth Proportional to 20,911.87, 28,852.77 and 12,406.92

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Solution

The fourth proportional to 20,911.87, 28,852.77 and 12,406.92 is: 17,118.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.87 : 28,852.77 = 12,406.92 : x
  2. Step 2: Convert to fraction form
    20,911.87/28,852.77 = 12,406.92/x
  3. Step 3: Cross multiply
    20,911.87x = 28,852.77 × 12,406.92
  4. Step 4: Simplify right side
    20,911.87x = 357,974,009.17
  5. Step 5: Solve for x
    x = 357,974,009.17/20,911.87
  6. Step 6: Final answer
    x = 17,118.22

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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.