Home / 20,985.14-28,959.70-11,553.90

Finding the Fourth Proportional to 20,985.14, 28,959.70 and 11,553.90

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Solution

The fourth proportional to 20,985.14, 28,959.70 and 11,553.90 is: 15,944.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.14 : 28,959.70 = 11,553.90 : x
  2. Step 2: Convert to fraction form
    20,985.14/28,959.70 = 11,553.90/x
  3. Step 3: Cross multiply
    20,985.14x = 28,959.70 × 11,553.90
  4. Step 4: Simplify right side
    20,985.14x = 334,597,477.83
  5. Step 5: Solve for x
    x = 334,597,477.83/20,985.14
  6. Step 6: Final answer
    x = 15,944.50

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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.