Home / 84,718,905.20-127,078,357.80-81,131,678.45

Finding the Fourth Proportional to 84,718,905.20, 127,078,357.80 and 81,131,678.45

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Solution

The fourth proportional to 84,718,905.20, 127,078,357.80 and 81,131,678.45 is: 121,697,517.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,718,905.20 : 127,078,357.80 = 81,131,678.45 : x
  2. Step 2: Convert to fraction form
    84,718,905.20/127,078,357.80 = 81,131,678.45/x
  3. Step 3: Cross multiply
    84,718,905.20x = 127,078,357.80 × 81,131,678.45
  4. Step 4: Simplify right side
    84,718,905.20x = 10,310,080,462,983,650
  5. Step 5: Solve for x
    x = 10,310,080,462,983,650/84,718,905.20
  6. Step 6: Final answer
    x = 121,697,517.68

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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.