Home / 15,930.90-21,985.38-8,859.60

Finding the Fourth Proportional to 15,930.90, 21,985.38 and 8,859.60

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Solution

The fourth proportional to 15,930.90, 21,985.38 and 8,859.60 is: 12,226.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,930.90 : 21,985.38 = 8,859.60 : x
  2. Step 2: Convert to fraction form
    15,930.90/21,985.38 = 8,859.60/x
  3. Step 3: Cross multiply
    15,930.90x = 21,985.38 × 8,859.60
  4. Step 4: Simplify right side
    15,930.90x = 194,781,672.65
  5. Step 5: Solve for x
    x = 194,781,672.65/15,930.90
  6. Step 6: Final answer
    x = 12,226.66

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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.