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Finding the Fourth Proportional to 65.54, 90.40 and 40.96

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Solution

The fourth proportional to 65.54, 90.40 and 40.96 is: 56.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.54 : 90.40 = 40.96 : x
  2. Step 2: Convert to fraction form
    65.54/90.40 = 40.96/x
  3. Step 3: Cross multiply
    65.54x = 90.40 × 40.96
  4. Step 4: Simplify right side
    65.54x = 3,702.13
  5. Step 5: Solve for x
    x = 3,702.13/65.54
  6. Step 6: Final answer
    x = 56.49

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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.