Home / 128,305,721.80-192,080,669.10-120,831,430.60

Finding the Fourth Proportional to 128,305,721.80, 192,080,669.10 and 120,831,430.60

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Solution

The fourth proportional to 128,305,721.80, 192,080,669.10 and 120,831,430.60 is: 180,891,247.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,305,721.80 : 192,080,669.10 = 120,831,430.60 : x
  2. Step 2: Convert to fraction form
    128,305,721.80/192,080,669.10 = 120,831,430.60/x
  3. Step 3: Cross multiply
    128,305,721.80x = 192,080,669.10 × 120,831,430.60
  4. Step 4: Simplify right side
    128,305,721.80x = 23,209,382,037,958,212
  5. Step 5: Solve for x
    x = 23,209,382,037,958,212/128,305,721.80
  6. Step 6: Final answer
    x = 180,891,247.19

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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.