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Finding the Fourth Proportional to 90,856.70, 136,090.65 and 81,007.10

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Solution

The fourth proportional to 90,856.70, 136,090.65 and 81,007.10 is: 121,337.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,856.70 : 136,090.65 = 81,007.10 : x
  2. Step 2: Convert to fraction form
    90,856.70/136,090.65 = 81,007.10/x
  3. Step 3: Cross multiply
    90,856.70x = 136,090.65 × 81,007.10
  4. Step 4: Simplify right side
    90,856.70x = 11,024,308,893.62
  5. Step 5: Solve for x
    x = 11,024,308,893.62/90,856.70
  6. Step 6: Final answer
    x = 121,337.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.