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Finding the Fourth Proportional to 90,392.98, 135,455.83 and 85,338.08

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Solution

The fourth proportional to 90,392.98, 135,455.83 and 85,338.08 is: 127,880.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,392.98 : 135,455.83 = 85,338.08 : x
  2. Step 2: Convert to fraction form
    90,392.98/135,455.83 = 85,338.08/x
  3. Step 3: Cross multiply
    90,392.98x = 135,455.83 × 85,338.08
  4. Step 4: Simplify right side
    90,392.98x = 11,559,539,566.38
  5. Step 5: Solve for x
    x = 11,559,539,566.38/90,392.98
  6. Step 6: Final answer
    x = 127,880.95

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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.