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Finding the Fourth Proportional to 90,995.74, 136,984.94 and 81,840.76

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Solution

The fourth proportional to 90,995.74, 136,984.94 and 81,840.76 is: 123,203.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,995.74 : 136,984.94 = 81,840.76 : x
  2. Step 2: Convert to fraction form
    90,995.74/136,984.94 = 81,840.76/x
  3. Step 3: Cross multiply
    90,995.74x = 136,984.94 × 81,840.76
  4. Step 4: Simplify right side
    90,995.74x = 11,210,951,598.15
  5. Step 5: Solve for x
    x = 11,210,951,598.15/90,995.74
  6. Step 6: Final answer
    x = 123,203.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.