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Finding the Fourth Proportional to 90.53, 124.80 and 65.64

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Solution

The fourth proportional to 90.53, 124.80 and 65.64 is: 90.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.53 : 124.80 = 65.64 : x
  2. Step 2: Convert to fraction form
    90.53/124.80 = 65.64/x
  3. Step 3: Cross multiply
    90.53x = 124.80 × 65.64
  4. Step 4: Simplify right side
    90.53x = 8,191.87
  5. Step 5: Solve for x
    x = 8,191.87/90.53
  6. Step 6: Final answer
    x = 90.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.