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Finding the Fourth Proportional to 158,612.67, 218,865.20 and 90,634.05

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Solution

The fourth proportional to 158,612.67, 218,865.20 and 90,634.05 is: 125,063.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,612.67 : 218,865.20 = 90,634.05 : x
  2. Step 2: Convert to fraction form
    158,612.67/218,865.20 = 90,634.05/x
  3. Step 3: Cross multiply
    158,612.67x = 218,865.20 × 90,634.05
  4. Step 4: Simplify right side
    158,612.67x = 19,836,639,026.89
  5. Step 5: Solve for x
    x = 19,836,639,026.89/158,612.67
  6. Step 6: Final answer
    x = 125,063.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.