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Finding the Fourth Proportional to 128,999,215.60, 181,109,085.20 and 128,999,215.60

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Solution

The fourth proportional to 128,999,215.60, 181,109,085.20 and 128,999,215.60 is: 181,109,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,999,215.60 : 181,109,085.20 = 128,999,215.60 : x
  2. Step 2: Convert to fraction form
    128,999,215.60/181,109,085.20 = 128,999,215.60/x
  3. Step 3: Cross multiply
    128,999,215.60x = 181,109,085.20 × 128,999,215.60
  4. Step 4: Simplify right side
    128,999,215.60x = 23,362,929,928,833,568
  5. Step 5: Solve for x
    x = 23,362,929,928,833,568/128,999,215.60
  6. Step 6: Final answer
    x = 181,109,085.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.