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Finding the Fourth Proportional to 258,076.80, 387,115.20 and 210,837.60

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Solution

The fourth proportional to 258,076.80, 387,115.20 and 210,837.60 is: 316,256.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,076.80 : 387,115.20 = 210,837.60 : x
  2. Step 2: Convert to fraction form
    258,076.80/387,115.20 = 210,837.60/x
  3. Step 3: Cross multiply
    258,076.80x = 387,115.20 × 210,837.60
  4. Step 4: Simplify right side
    258,076.80x = 81,618,439,691.52
  5. Step 5: Solve for x
    x = 81,618,439,691.52/258,076.80
  6. Step 6: Final answer
    x = 316,256.40

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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.