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Finding the Fourth Proportional to 66.64, 100.05 and 45.07

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Solution

The fourth proportional to 66.64, 100.05 and 45.07 is: 67.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.64 : 100.05 = 45.07 : x
  2. Step 2: Convert to fraction form
    66.64/100.05 = 45.07/x
  3. Step 3: Cross multiply
    66.64x = 100.05 × 45.07
  4. Step 4: Simplify right side
    66.64x = 4,509.65
  5. Step 5: Solve for x
    x = 4,509.65/66.64
  6. Step 6: Final answer
    x = 67.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.