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Finding the Fourth Proportional to 258,119.40, 387,470.70 and 199,216.20

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Solution

The fourth proportional to 258,119.40, 387,470.70 and 199,216.20 is: 299,049.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,119.40 : 387,470.70 = 199,216.20 : x
  2. Step 2: Convert to fraction form
    258,119.40/387,470.70 = 199,216.20/x
  3. Step 3: Cross multiply
    258,119.40x = 387,470.70 × 199,216.20
  4. Step 4: Simplify right side
    258,119.40x = 77,190,440,465.34
  5. Step 5: Solve for x
    x = 77,190,440,465.34/258,119.40
  6. Step 6: Final answer
    x = 299,049.36

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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.