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Finding the Fourth Proportional to 661.91, 912.74 and 476.28

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Solution

The fourth proportional to 661.91, 912.74 and 476.28 is: 656.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.91 : 912.74 = 476.28 : x
  2. Step 2: Convert to fraction form
    661.91/912.74 = 476.28/x
  3. Step 3: Cross multiply
    661.91x = 912.74 × 476.28
  4. Step 4: Simplify right side
    661.91x = 434,717.43
  5. Step 5: Solve for x
    x = 434,717.43/661.91
  6. Step 6: Final answer
    x = 656.77

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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.