Home / 12,900.20-19,335.90-6,657.80

Finding the Fourth Proportional to 12,900.20, 19,335.90 and 6,657.80

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Solution

The fourth proportional to 12,900.20, 19,335.90 and 6,657.80 is: 9,979.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,900.20 : 19,335.90 = 6,657.80 : x
  2. Step 2: Convert to fraction form
    12,900.20/19,335.90 = 6,657.80/x
  3. Step 3: Cross multiply
    12,900.20x = 19,335.90 × 6,657.80
  4. Step 4: Simplify right side
    12,900.20x = 128,734,555.02
  5. Step 5: Solve for x
    x = 128,734,555.02/12,900.20
  6. Step 6: Final answer
    x = 9,979.27

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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.