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Finding the Fourth Proportional to 158,630.40, 218,921.08 and 90,657.40

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Solution

The fourth proportional to 158,630.40, 218,921.08 and 90,657.40 is: 125,113.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,630.40 : 218,921.08 = 90,657.40 : x
  2. Step 2: Convert to fraction form
    158,630.40/218,921.08 = 90,657.40/x
  3. Step 3: Cross multiply
    158,630.40x = 218,921.08 × 90,657.40
  4. Step 4: Simplify right side
    158,630.40x = 19,846,815,917.99
  5. Step 5: Solve for x
    x = 19,846,815,917.99/158,630.40
  6. Step 6: Final answer
    x = 125,113.57

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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.