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Finding the Fourth Proportional to 338,876.20, 508,515.90 and 128,535.40

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Solution

The fourth proportional to 338,876.20, 508,515.90 and 128,535.40 is: 192,879.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,876.20 : 508,515.90 = 128,535.40 : x
  2. Step 2: Convert to fraction form
    338,876.20/508,515.90 = 128,535.40/x
  3. Step 3: Cross multiply
    338,876.20x = 508,515.90 × 128,535.40
  4. Step 4: Simplify right side
    338,876.20x = 65,362,294,612.86
  5. Step 5: Solve for x
    x = 65,362,294,612.86/338,876.20
  6. Step 6: Final answer
    x = 192,879.57

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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.