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Finding the Fourth Proportional to 338,857.20, 508,487.40 and 128,516.40

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Solution

The fourth proportional to 338,857.20, 508,487.40 and 128,516.40 is: 192,851.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,857.20 : 508,487.40 = 128,516.40 : x
  2. Step 2: Convert to fraction form
    338,857.20/508,487.40 = 128,516.40/x
  3. Step 3: Cross multiply
    338,857.20x = 508,487.40 × 128,516.40
  4. Step 4: Simplify right side
    338,857.20x = 65,348,970,093.36
  5. Step 5: Solve for x
    x = 65,348,970,093.36/338,857.20
  6. Step 6: Final answer
    x = 192,851.06

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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.