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Finding the Fourth Proportional to 338,962.88, 508,578.24 and 128,656.64

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Solution

The fourth proportional to 338,962.88, 508,578.24 and 128,656.64 is: 193,035.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,962.88 : 508,578.24 = 128,656.64 : x
  2. Step 2: Convert to fraction form
    338,962.88/508,578.24 = 128,656.64/x
  3. Step 3: Cross multiply
    338,962.88x = 508,578.24 × 128,656.64
  4. Step 4: Simplify right side
    338,962.88x = 65,431,967,535.51
  5. Step 5: Solve for x
    x = 65,431,967,535.51/338,962.88
  6. Step 6: Final answer
    x = 193,035.79

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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.