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Finding the Fourth Proportional to 215,689.40, 323,726.10 and 126,831.80

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Solution

The fourth proportional to 215,689.40, 323,726.10 and 126,831.80 is: 190,360.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,689.40 : 323,726.10 = 126,831.80 : x
  2. Step 2: Convert to fraction form
    215,689.40/323,726.10 = 126,831.80/x
  3. Step 3: Cross multiply
    215,689.40x = 323,726.10 × 126,831.80
  4. Step 4: Simplify right side
    215,689.40x = 41,058,763,969.98
  5. Step 5: Solve for x
    x = 41,058,763,969.98/215,689.40
  6. Step 6: Final answer
    x = 190,360.60

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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.