Home / 338,977.20-508,667.40-128,636.40

Finding the Fourth Proportional to 338,977.20, 508,667.40 and 128,636.40

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Solution

The fourth proportional to 338,977.20, 508,667.40 and 128,636.40 is: 193,031.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,977.20 : 508,667.40 = 128,636.40 : x
  2. Step 2: Convert to fraction form
    338,977.20/508,667.40 = 128,636.40/x
  3. Step 3: Cross multiply
    338,977.20x = 508,667.40 × 128,636.40
  4. Step 4: Simplify right side
    338,977.20x = 65,433,143,133.36
  5. Step 5: Solve for x
    x = 65,433,143,133.36/338,977.20
  6. Step 6: Final answer
    x = 193,031.10

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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.