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Finding the Fourth Proportional to 66.37, 90.40 and 66.19

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Solution

The fourth proportional to 66.37, 90.40 and 66.19 is: 90.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.37 : 90.40 = 66.19 : x
  2. Step 2: Convert to fraction form
    66.37/90.40 = 66.19/x
  3. Step 3: Cross multiply
    66.37x = 90.40 × 66.19
  4. Step 4: Simplify right side
    66.37x = 5,983.58
  5. Step 5: Solve for x
    x = 5,983.58/66.37
  6. Step 6: Final answer
    x = 90.15

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.