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Finding the Fourth Proportional to 475.60, 656.16 and 289.15

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Solution

The fourth proportional to 475.60, 656.16 and 289.15 is: 398.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.60 : 656.16 = 289.15 : x
  2. Step 2: Convert to fraction form
    475.60/656.16 = 289.15/x
  3. Step 3: Cross multiply
    475.60x = 656.16 × 289.15
  4. Step 4: Simplify right side
    475.60x = 189,728.66
  5. Step 5: Solve for x
    x = 189,728.66/475.60
  6. Step 6: Final answer
    x = 398.92

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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.