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Finding the Fourth Proportional to 98,575.80, 135,604.16 and 86,421.55

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Solution

The fourth proportional to 98,575.80, 135,604.16 and 86,421.55 is: 118,884.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,575.80 : 135,604.16 = 86,421.55 : x
  2. Step 2: Convert to fraction form
    98,575.80/135,604.16 = 86,421.55/x
  3. Step 3: Cross multiply
    98,575.80x = 135,604.16 × 86,421.55
  4. Step 4: Simplify right side
    98,575.80x = 11,719,120,583.52
  5. Step 5: Solve for x
    x = 11,719,120,583.52/98,575.80
  6. Step 6: Final answer
    x = 118,884.36

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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.