Home / 20,985.88-28,951.84-12,486.31

Finding the Fourth Proportional to 20,985.88, 28,951.84 and 12,486.31

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Solution

The fourth proportional to 20,985.88, 28,951.84 and 12,486.31 is: 17,225.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.88 : 28,951.84 = 12,486.31 : x
  2. Step 2: Convert to fraction form
    20,985.88/28,951.84 = 12,486.31/x
  3. Step 3: Cross multiply
    20,985.88x = 28,951.84 × 12,486.31
  4. Step 4: Simplify right side
    20,985.88x = 361,501,442.12
  5. Step 5: Solve for x
    x = 361,501,442.12/20,985.88
  6. Step 6: Final answer
    x = 17,225.94

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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.