Home / 12,930.24-19,395.60-5,138.40

Finding the Fourth Proportional to 12,930.24, 19,395.60 and 5,138.40

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Solution

The fourth proportional to 12,930.24, 19,395.60 and 5,138.40 is: 7,707.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,930.24 : 19,395.60 = 5,138.40 : x
  2. Step 2: Convert to fraction form
    12,930.24/19,395.60 = 5,138.40/x
  3. Step 3: Cross multiply
    12,930.24x = 19,395.60 × 5,138.40
  4. Step 4: Simplify right side
    12,930.24x = 99,662,351.04
  5. Step 5: Solve for x
    x = 99,662,351.04/12,930.24
  6. Step 6: Final answer
    x = 7,707.70

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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.