Home / 20,985.12-28,959.66-11,553.75

Finding the Fourth Proportional to 20,985.12, 28,959.66 and 11,553.75

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Solution

The fourth proportional to 20,985.12, 28,959.66 and 11,553.75 is: 15,944.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.12 : 28,959.66 = 11,553.75 : x
  2. Step 2: Convert to fraction form
    20,985.12/28,959.66 = 11,553.75/x
  3. Step 3: Cross multiply
    20,985.12x = 28,959.66 × 11,553.75
  4. Step 4: Simplify right side
    20,985.12x = 334,592,671.73
  5. Step 5: Solve for x
    x = 334,592,671.73/20,985.12
  6. Step 6: Final answer
    x = 15,944.28

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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.