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Finding the Fourth Proportional to 90,605.79, 135,848.70 and 43,228.20

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Solution

The fourth proportional to 90,605.79, 135,848.70 and 43,228.20 is: 64,813.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,605.79 : 135,848.70 = 43,228.20 : x
  2. Step 2: Convert to fraction form
    90,605.79/135,848.70 = 43,228.20/x
  3. Step 3: Cross multiply
    90,605.79x = 135,848.70 × 43,228.20
  4. Step 4: Simplify right side
    90,605.79x = 5,872,494,773.34
  5. Step 5: Solve for x
    x = 5,872,494,773.34/90,605.79
  6. Step 6: Final answer
    x = 64,813.68

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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.