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Finding the Fourth Proportional to 90,820.79, 136,231.27 and 43,424.74

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Solution

The fourth proportional to 90,820.79, 136,231.27 and 43,424.74 is: 65,137.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,820.79 : 136,231.27 = 43,424.74 : x
  2. Step 2: Convert to fraction form
    90,820.79/136,231.27 = 43,424.74/x
  3. Step 3: Cross multiply
    90,820.79x = 136,231.27 × 43,424.74
  4. Step 4: Simplify right side
    90,820.79x = 5,915,807,541.35
  5. Step 5: Solve for x
    x = 5,915,807,541.35/90,820.79
  6. Step 6: Final answer
    x = 65,137.15

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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.