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Finding the Fourth Proportional to 90.36, 135.60 and 47.64

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Solution

The fourth proportional to 90.36, 135.60 and 47.64 is: 71.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.36 : 135.60 = 47.64 : x
  2. Step 2: Convert to fraction form
    90.36/135.60 = 47.64/x
  3. Step 3: Cross multiply
    90.36x = 135.60 × 47.64
  4. Step 4: Simplify right side
    90.36x = 6,459.98
  5. Step 5: Solve for x
    x = 6,459.98/90.36
  6. Step 6: Final answer
    x = 71.49

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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.