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Finding the Fourth Proportional to 66.37, 91.99 and 65.16

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Solution

The fourth proportional to 66.37, 91.99 and 65.16 is: 90.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.37 : 91.99 = 65.16 : x
  2. Step 2: Convert to fraction form
    66.37/91.99 = 65.16/x
  3. Step 3: Cross multiply
    66.37x = 91.99 × 65.16
  4. Step 4: Simplify right side
    66.37x = 5,994.07
  5. Step 5: Solve for x
    x = 5,994.07/66.37
  6. Step 6: Final answer
    x = 90.31

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.