Home / 12,930.36-19,398.80-5,139.80

Finding the Fourth Proportional to 12,930.36, 19,398.80 and 5,139.80

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Solution

The fourth proportional to 12,930.36, 19,398.80 and 5,139.80 is: 7,711.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,930.36 : 19,398.80 = 5,139.80 : x
  2. Step 2: Convert to fraction form
    12,930.36/19,398.80 = 5,139.80/x
  3. Step 3: Cross multiply
    12,930.36x = 19,398.80 × 5,139.80
  4. Step 4: Simplify right side
    12,930.36x = 99,705,952.24
  5. Step 5: Solve for x
    x = 99,705,952.24/12,930.36
  6. Step 6: Final answer
    x = 7,711.00

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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.