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Finding the Fourth Proportional to 98,340, 135,720.81 and 55,904.88

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Solution

The fourth proportional to 98,340, 135,720.81 and 55,904.88 is: 77,155.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,340 : 135,720.81 = 55,904.88 : x
  2. Step 2: Convert to fraction form
    98,340/135,720.81 = 55,904.88/x
  3. Step 3: Cross multiply
    98,340x = 135,720.81 × 55,904.88
  4. Step 4: Simplify right side
    98,340x = 7,587,455,596.55
  5. Step 5: Solve for x
    x = 7,587,455,596.55/98,340
  6. Step 6: Final answer
    x = 77,155.33

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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.