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Finding the Fourth Proportional to 66.58, 91.90 and 42.01

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Solution

The fourth proportional to 66.58, 91.90 and 42.01 is: 57.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.58 : 91.90 = 42.01 : x
  2. Step 2: Convert to fraction form
    66.58/91.90 = 42.01/x
  3. Step 3: Cross multiply
    66.58x = 91.90 × 42.01
  4. Step 4: Simplify right side
    66.58x = 3,860.15
  5. Step 5: Solve for x
    x = 3,860.15/66.58
  6. Step 6: Final answer
    x = 57.98

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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.