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Finding the Fourth Proportional to 258,415.40, 387,623.10 and 80,976.80

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Solution

The fourth proportional to 258,415.40, 387,623.10 and 80,976.80 is: 121,465.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,415.40 : 387,623.10 = 80,976.80 : x
  2. Step 2: Convert to fraction form
    258,415.40/387,623.10 = 80,976.80/x
  3. Step 3: Cross multiply
    258,415.40x = 387,623.10 × 80,976.80
  4. Step 4: Simplify right side
    258,415.40x = 31,388,478,244.08
  5. Step 5: Solve for x
    x = 31,388,478,244.08/258,415.40
  6. Step 6: Final answer
    x = 121,465.20

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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.