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Finding the Fourth Proportional to 98,403.80, 135,786.03 and 55,374.98

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Solution

The fourth proportional to 98,403.80, 135,786.03 and 55,374.98 is: 76,411.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,403.80 : 135,786.03 = 55,374.98 : x
  2. Step 2: Convert to fraction form
    98,403.80/135,786.03 = 55,374.98/x
  3. Step 3: Cross multiply
    98,403.80x = 135,786.03 × 55,374.98
  4. Step 4: Simplify right side
    98,403.80x = 7,519,148,695.53
  5. Step 5: Solve for x
    x = 7,519,148,695.53/98,403.80
  6. Step 6: Final answer
    x = 76,411.16

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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.