Home / 14,390.90-21,555.10-6,979.78

Finding the Fourth Proportional to 14,390.90, 21,555.10 and 6,979.78

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Solution

The fourth proportional to 14,390.90, 21,555.10 and 6,979.78 is: 10,454.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,390.90 : 21,555.10 = 6,979.78 : x
  2. Step 2: Convert to fraction form
    14,390.90/21,555.10 = 6,979.78/x
  3. Step 3: Cross multiply
    14,390.90x = 21,555.10 × 6,979.78
  4. Step 4: Simplify right side
    14,390.90x = 150,449,891.55
  5. Step 5: Solve for x
    x = 150,449,891.55/14,390.90
  6. Step 6: Final answer
    x = 10,454.52

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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.