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Finding the Fourth Proportional to 98,901.76, 136,382.16 and 68,721.28

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Solution

The fourth proportional to 98,901.76, 136,382.16 and 68,721.28 is: 94,764.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,901.76 : 136,382.16 = 68,721.28 : x
  2. Step 2: Convert to fraction form
    98,901.76/136,382.16 = 68,721.28/x
  3. Step 3: Cross multiply
    98,901.76x = 136,382.16 × 68,721.28
  4. Step 4: Simplify right side
    98,901.76x = 9,372,356,604.36
  5. Step 5: Solve for x
    x = 9,372,356,604.36/98,901.76
  6. Step 6: Final answer
    x = 94,764.31

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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.