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Finding the Fourth Proportional to 153,976.80, 230,965.20 and 90,991.20

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Solution

The fourth proportional to 153,976.80, 230,965.20 and 90,991.20 is: 136,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,976.80 : 230,965.20 = 90,991.20 : x
  2. Step 2: Convert to fraction form
    153,976.80/230,965.20 = 90,991.20/x
  3. Step 3: Cross multiply
    153,976.80x = 230,965.20 × 90,991.20
  4. Step 4: Simplify right side
    153,976.80x = 21,015,800,706.24
  5. Step 5: Solve for x
    x = 21,015,800,706.24/153,976.80
  6. Step 6: Final answer
    x = 136,486.80

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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.