Home / 21,109.08-31,678.03-11,255.28

Finding the Fourth Proportional to 21,109.08, 31,678.03 and 11,255.28

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Solution

The fourth proportional to 21,109.08, 31,678.03 and 11,255.28 is: 16,890.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.08 : 31,678.03 = 11,255.28 : x
  2. Step 2: Convert to fraction form
    21,109.08/31,678.03 = 11,255.28/x
  3. Step 3: Cross multiply
    21,109.08x = 31,678.03 × 11,255.28
  4. Step 4: Simplify right side
    21,109.08x = 356,545,097.50
  5. Step 5: Solve for x
    x = 356,545,097.50/21,109.08
  6. Step 6: Final answer
    x = 16,890.60

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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.