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Finding the Fourth Proportional to 98,398.60, 135,795.78 and 74,487.40

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Solution

The fourth proportional to 98,398.60, 135,795.78 and 74,487.40 is: 102,796.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,398.60 : 135,795.78 = 74,487.40 : x
  2. Step 2: Convert to fraction form
    98,398.60/135,795.78 = 74,487.40/x
  3. Step 3: Cross multiply
    98,398.60x = 135,795.78 × 74,487.40
  4. Step 4: Simplify right side
    98,398.60x = 10,115,074,583.17
  5. Step 5: Solve for x
    x = 10,115,074,583.17/98,398.60
  6. Step 6: Final answer
    x = 102,796.94

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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.