Home / 20,929.99-28,888.68-11,980.30

Finding the Fourth Proportional to 20,929.99, 28,888.68 and 11,980.30

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Solution

The fourth proportional to 20,929.99, 28,888.68 and 11,980.30 is: 16,535.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.99 : 28,888.68 = 11,980.30 : x
  2. Step 2: Convert to fraction form
    20,929.99/28,888.68 = 11,980.30/x
  3. Step 3: Cross multiply
    20,929.99x = 28,888.68 × 11,980.30
  4. Step 4: Simplify right side
    20,929.99x = 346,095,053.00
  5. Step 5: Solve for x
    x = 346,095,053.00/20,929.99
  6. Step 6: Final answer
    x = 16,535.84

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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.