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Finding the Fourth Proportional to 258,873.08, 388,422.70 and 90,514.30

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Solution

The fourth proportional to 258,873.08, 388,422.70 and 90,514.30 is: 135,810.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,873.08 : 388,422.70 = 90,514.30 : x
  2. Step 2: Convert to fraction form
    258,873.08/388,422.70 = 90,514.30/x
  3. Step 3: Cross multiply
    258,873.08x = 388,422.70 × 90,514.30
  4. Step 4: Simplify right side
    258,873.08x = 35,157,808,794.61
  5. Step 5: Solve for x
    x = 35,157,808,794.61/258,873.08
  6. Step 6: Final answer
    x = 135,810.99

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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.