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Finding the Fourth Proportional to 445.07, 666.86 and 290.77

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Solution

The fourth proportional to 445.07, 666.86 and 290.77 is: 435.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.07 : 666.86 = 290.77 : x
  2. Step 2: Convert to fraction form
    445.07/666.86 = 290.77/x
  3. Step 3: Cross multiply
    445.07x = 666.86 × 290.77
  4. Step 4: Simplify right side
    445.07x = 193,901.43
  5. Step 5: Solve for x
    x = 193,901.43/445.07
  6. Step 6: Final answer
    x = 435.67

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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.