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Finding the Fourth Proportional to 98,361.12, 135,738 and 55,919.64

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Solution

The fourth proportional to 98,361.12, 135,738 and 55,919.64 is: 77,168.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,361.12 : 135,738 = 55,919.64 : x
  2. Step 2: Convert to fraction form
    98,361.12/135,738 = 55,919.64/x
  3. Step 3: Cross multiply
    98,361.12x = 135,738 × 55,919.64
  4. Step 4: Simplify right side
    98,361.12x = 7,590,420,094.32
  5. Step 5: Solve for x
    x = 7,590,420,094.32/98,361.12
  6. Step 6: Final answer
    x = 77,168.91

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1.5x scale

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.