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Finding the Fourth Proportional to 475.88, 656.66 and 289.28

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Solution

The fourth proportional to 475.88, 656.66 and 289.28 is: 399.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.88 : 656.66 = 289.28 : x
  2. Step 2: Convert to fraction form
    475.88/656.66 = 289.28/x
  3. Step 3: Cross multiply
    475.88x = 656.66 × 289.28
  4. Step 4: Simplify right side
    475.88x = 189,953.88
  5. Step 5: Solve for x
    x = 189,953.88/475.88
  6. Step 6: Final answer
    x = 399.17

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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.