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Finding the Fourth Proportional to 656.91, 986.57 and 440.64

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Solution

The fourth proportional to 656.91, 986.57 and 440.64 is: 661.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.91 : 986.57 = 440.64 : x
  2. Step 2: Convert to fraction form
    656.91/986.57 = 440.64/x
  3. Step 3: Cross multiply
    656.91x = 986.57 × 440.64
  4. Step 4: Simplify right side
    656.91x = 434,717.27
  5. Step 5: Solve for x
    x = 434,717.27/656.91
  6. Step 6: Final answer
    x = 661.77

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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.