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Finding the Fourth Proportional to 420,852.80, 631,367.86 and 136,521.15

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Solution

The fourth proportional to 420,852.80, 631,367.86 and 136,521.15 is: 204,810.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,852.80 : 631,367.86 = 136,521.15 : x
  2. Step 2: Convert to fraction form
    420,852.80/631,367.86 = 136,521.15/x
  3. Step 3: Cross multiply
    420,852.80x = 631,367.86 × 136,521.15
  4. Step 4: Simplify right side
    420,852.80x = 86,195,062,480.79
  5. Step 5: Solve for x
    x = 86,195,062,480.79/420,852.80
  6. Step 6: Final answer
    x = 204,810.48

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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.